import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.Scanner;

public class Main {
    static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private SpaceCharFilter filter;

        public InputReader(InputStream stream) {
            this.stream = stream;
        }

        public int next() {
            if (numChars == -1)
                throw new InputMismatchException();
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        }

        public String nextStr() {
            int c = next();
            while (isSpaceChar(c)) {
                c = next();
            }
            StringBuffer str = new StringBuffer();
            do {
                str.append((char) c);
                c = next();
            } while (!isSpaceChar(c));
            return str.toString();
        }

        public int nextInt() {
            int c = next();
            while (isSpaceChar(c))
                c = next();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = next();
            }
            int res = 0;
            do {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = next();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public boolean isSpaceChar(int c) {
            if (filter != null)
                return filter.isSpaceChar(c);
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);
        }
    }
    private static int binarySearch(int sp2[], int key, int left, int right) {
        int mid = (left + right) / 2;
        if (left > right) {
            return -1;
        }
        if (key==sp2[mid]) {
            return 1;
        } else if (key > sp2[mid]) {
            return binarySearch(sp2, key, mid+1, right);
        } else {
            return binarySearch(sp2, key, left, mid-1);
        }

    }
    public static void main(String[] args) throws IOException {

        InputReader sc = new InputReader(System.in);
        int n1 = sc.nextInt();
        int sp1[] = new int[n1];
        for (int i = 0; i < n1; i++) {
            sp1[i] = sc.nextInt();
        }
        int n2 = sc.nextInt();
        int sp2[] = new int[n1];
        for (int i = 0; i < n2; i++) {
            sp2[i] = sc.nextInt();
        }
        int sum = 0;
        for (int j = 0; j < n2; j++) {
            if (binarySearch(sp1, sp2[j],0,sp1.length) > 0) {
                sum++;
            }
        }
        System.out.println(sum);
    }
}
 import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.util.Arrays; Arrays java.util import java.util.InputMismatchException; InputMismatchException java.util import java.util.Scanner; Scanner java.util public class Main {
    static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private SpaceCharFilter filter;

        public InputReader(InputStream stream) {
            this.stream = stream;
        }

        public int next() {
            if (numChars == -1)
                throw new InputMismatchException();
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        }

        public String nextStr() {
            int c = next();
            while (isSpaceChar(c)) {
                c = next();
            }
            StringBuffer str = new StringBuffer();
            do {
                str.append((char) c);
                c = next();
            } while (!isSpaceChar(c));
            return str.toString();
        }

        public int nextInt() {
            int c = next();
            while (isSpaceChar(c))
                c = next();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = next();
            }
            int res = 0;
            do {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = next();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public boolean isSpaceChar(int c) {
            if (filter != null)
                return filter.isSpaceChar(c);
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);
        }
    }
    private static int binarySearch(int sp2[], int key, int left, int right) {
        int mid = (left + right) / 2;
        if (left > right) {
            return -1;
        }
        if (key==sp2[mid]) {
            return 1;
        } else if (key > sp2[mid]) {
            return binarySearch(sp2, key, mid+1, right);
        } else {
            return binarySearch(sp2, key, left, mid-1);
        }

    }
    public static void main(String[] args) throws IOException {

        InputReader sc = new InputReader(System.in);
        int n1 = sc.nextInt();
        int sp1[] = new int[n1];
        for (int i = 0; i < n1; i++) {
            sp1[i] = sc.nextInt();
        }
        int n2 = sc.nextInt();
        int sp2[] = new int[n1];
        for (int i = 0; i < n2; i++) {
            sp2[i] = sc.nextInt();
        }
        int sum = 0;
        for (int j = 0; j < n2; j++) {
            if (binarySearch(sp1, sp2[j],0,sp1.length) > 0) {
                sum++;
            }
        }
        System.out.println(sum);
    }
} Main private static int binarySearch(int sp2[], int key, int left, int right) {
        int mid = (left + right) / 2;
        if (left > right) {
            return -1;
        }
        if (key==sp2[mid]) {
            return 1;
        } else if (key > sp2[mid]) {
            return binarySearch(sp2, key, mid+1, right);
        } else {
            return binarySearch(sp2, key, left, mid-1);
        }

    } binarySearch {
        int mid = (left + right) / 2;
        if (left > right) {
            return -1;
        }
        if (key==sp2[mid]) {
            return 1;
        } else if (key > sp2[mid]) {
            return binarySearch(sp2, key, mid+1, right);
        } else {
            return binarySearch(sp2, key, left, mid-1);
        }

    } int mid = (left + right) / 2; mid (left + right) / 2 (left + right) left right 2 if (left > right) {
            return -1;
        } left > right left right {
            return -1;
        } return -1; -1 1 if (key==sp2[mid]) {
            return 1;
        } else if (key > sp2[mid]) {
            return binarySearch(sp2, key, mid+1, right);
        } else {
            return binarySearch(sp2, key, left, mid-1);
        } key==sp2[mid] key sp2[mid] sp2 mid {
            return 1;
        } return 1; 1 if (key > sp2[mid]) {
            return binarySearch(sp2, key, mid+1, right);
        } else {
            return binarySearch(sp2, key, left, mid-1);
        } key > sp2[mid] key sp2[mid] sp2 mid {
            return binarySearch(sp2, key, mid+1, right);
        } return binarySearch(sp2, key, mid+1, right); binarySearch(sp2, key, mid+1, right) binarySearch sp2 key mid+1 mid 1 right {
            return binarySearch(sp2, key, left, mid-1);
        } return binarySearch(sp2, key, left, mid-1); binarySearch(sp2, key, left, mid-1) binarySearch sp2 key left mid-1 mid 1 int sp2[] sp2 int key key int left left int right right public static void main(String[] args) throws IOException {

        InputReader sc = new InputReader(System.in);
        int n1 = sc.nextInt();
        int sp1[] = new int[n1];
        for (int i = 0; i < n1; i++) {
            sp1[i] = sc.nextInt();
        }
        int n2 = sc.nextInt();
        int sp2[] = new int[n1];
        for (int i = 0; i < n2; i++) {
            sp2[i] = sc.nextInt();
        }
        int sum = 0;
        for (int j = 0; j < n2; j++) {
            if (binarySearch(sp1, sp2[j],0,sp1.length) > 0) {
                sum++;
            }
        }
        System.out.println(sum);
    } main {

        InputReader sc = new InputReader(System.in);
        int n1 = sc.nextInt();
        int sp1[] = new int[n1];
        for (int i = 0; i < n1; i++) {
            sp1[i] = sc.nextInt();
        }
        int n2 = sc.nextInt();
        int sp2[] = new int[n1];
        for (int i = 0; i < n2; i++) {
            sp2[i] = sc.nextInt();
        }
        int sum = 0;
        for (int j = 0; j < n2; j++) {
            if (binarySearch(sp1, sp2[j],0,sp1.length) > 0) {
                sum++;
            }
        }
        System.out.println(sum);
    } InputReader sc = new InputReader(System.in); sc new InputReader(System.in) int n1 = sc.nextInt(); n1 sc.nextInt() sc.nextInt sc int sp1[] = new int[n1]; sp1 new int[n1] n1 for (int i = 0; i < n1; i++) {
            sp1[i] = sc.nextInt();
        } int i = 0; int i = 0; i 0 i < n1 i n1 i++ i++ i {
            sp1[i] = sc.nextInt();
        } {
            sp1[i] = sc.nextInt();
        } sp1[i] = sc.nextInt() sp1[i] sp1 i sc.nextInt() sc.nextInt sc int n2 = sc.nextInt(); n2 sc.nextInt() sc.nextInt sc int sp2[] = new int[n1]; sp2 new int[n1] n1 for (int i = 0; i < n2; i++) {
            sp2[i] = sc.nextInt();
        } int i = 0; int i = 0; i 0 i < n2 i n2 i++ i++ i {
            sp2[i] = sc.nextInt();
        } {
            sp2[i] = sc.nextInt();
        } sp2[i] = sc.nextInt() sp2[i] sp2 i sc.nextInt() sc.nextInt sc int sum = 0; sum 0 for (int j = 0; j < n2; j++) {
            if (binarySearch(sp1, sp2[j],0,sp1.length) > 0) {
                sum++;
            }
        } int j = 0; int j = 0; j 0 j < n2 j n2 j++ j++ j {
            if (binarySearch(sp1, sp2[j],0,sp1.length) > 0) {
                sum++;
            }
        } {
            if (binarySearch(sp1, sp2[j],0,sp1.length) > 0) {
                sum++;
            }
        } if (binarySearch(sp1, sp2[j],0,sp1.length) > 0) {
                sum++;
            } binarySearch(sp1, sp2[j],0,sp1.length) > 0 binarySearch(sp1, sp2[j],0,sp1.length) binarySearch sp1 sp2[j] sp2 j 0 sp1.length sp1 sp1.length 0 {
                sum++;
            } sum++ sum System.out.println(sum) System.out.println System.out System System.out sum String[] args args static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private SpaceCharFilter filter;

        public InputReader(InputStream stream) {
            this.stream = stream;
        }

        public int next() {
            if (numChars == -1)
                throw new InputMismatchException();
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        }

        public String nextStr() {
            int c = next();
            while (isSpaceChar(c)) {
                c = next();
            }
            StringBuffer str = new StringBuffer();
            do {
                str.append((char) c);
                c = next();
            } while (!isSpaceChar(c));
            return str.toString();
        }

        public int nextInt() {
            int c = next();
            while (isSpaceChar(c))
                c = next();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = next();
            }
            int res = 0;
            do {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = next();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public boolean isSpaceChar(int c) {
            if (filter != null)
                return filter.isSpaceChar(c);
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);
        }
    } InputReader private InputStream stream; stream private byte[] buf = new byte[1024]; buf new byte[1024] 1024 private int curChar; curChar private int numChars; numChars private SpaceCharFilter filter; filter public InputReader(InputStream stream) {
            this.stream = stream;
        } InputReader {
            this.stream = stream;
        } this.stream = stream this.stream this this.stream stream InputStream stream stream public int next() {
            if (numChars == -1)
                throw new InputMismatchException();
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        } next {
            if (numChars == -1)
                throw new InputMismatchException();
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        } if (numChars == -1)
                throw new InputMismatchException(); numChars == -1 numChars -1 1 throw new InputMismatchException(); new InputMismatchException() if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0)
                    return -1;
            } curChar >= numChars curChar numChars {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0)
                    return -1;
            } curChar = 0 curChar 0 try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                } catch (IOException e) {
                    throw new InputMismatchException();
                } IOException e {
                    throw new InputMismatchException();
                } throw new InputMismatchException(); new InputMismatchException() {
                    numChars = stream.read(buf);
                } numChars = stream.read(buf) numChars stream.read(buf) stream.read stream buf if (numChars <= 0)
                    return -1; numChars <= 0 numChars 0 return -1; -1 1 return buf[curChar++]; buf[curChar++] buf curChar++ curChar public String nextStr() {
            int c = next();
            while (isSpaceChar(c)) {
                c = next();
            }
            StringBuffer str = new StringBuffer();
            do {
                str.append((char) c);
                c = next();
            } while (!isSpaceChar(c));
            return str.toString();
        } nextStr {
            int c = next();
            while (isSpaceChar(c)) {
                c = next();
            }
            StringBuffer str = new StringBuffer();
            do {
                str.append((char) c);
                c = next();
            } while (!isSpaceChar(c));
            return str.toString();
        } int c = next(); c next() next while (isSpaceChar(c)) {
                c = next();
            } isSpaceChar(c) isSpaceChar c {
                c = next();
            } c = next() c next() next StringBuffer str = new StringBuffer(); str new StringBuffer() do {
                str.append((char) c);
                c = next();
            } while (!isSpaceChar(c)); !isSpaceChar(c) isSpaceChar(c) isSpaceChar c {
                str.append((char) c);
                c = next();
            } str.append((char) c) str.append str (char) c c = next() c next() next return str.toString(); str.toString() str.toString str public int nextInt() {
            int c = next();
            while (isSpaceChar(c))
                c = next();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = next();
            }
            int res = 0;
            do {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = next();
            } while (!isSpaceChar(c));
            return res * sgn;
        } nextInt {
            int c = next();
            while (isSpaceChar(c))
                c = next();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = next();
            }
            int res = 0;
            do {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = next();
            } while (!isSpaceChar(c));
            return res * sgn;
        } int c = next(); c next() next while (isSpaceChar(c))
                c = next(); isSpaceChar(c) isSpaceChar c c = next() c next() next int sgn = 1; sgn 1 if (c == '-') {
                sgn = -1;
                c = next();
            } c == '-' c '-' {
                sgn = -1;
                c = next();
            } sgn = -1 sgn -1 1 c = next() c next() next int res = 0; res 0 do {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = next();
            } while (!isSpaceChar(c)); !isSpaceChar(c) isSpaceChar(c) isSpaceChar c {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = next();
            } if (c < '0' || c > '9')
                    throw new InputMismatchException(); c < '0' || c > '9' c < '0' c '0' c > '9' c '9' throw new InputMismatchException(); new InputMismatchException() res *= 10 res 10 res += c - '0' res c - '0' c '0' c = next() c next() next return res * sgn; res * sgn res sgn public boolean isSpaceChar(int c) {
            if (filter != null)
                return filter.isSpaceChar(c);
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        } isSpaceChar {
            if (filter != null)
                return filter.isSpaceChar(c);
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        } if (filter != null)
                return filter.isSpaceChar(c); filter != null filter null return filter.isSpaceChar(c); filter.isSpaceChar(c) filter.isSpaceChar filter c return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1; c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1 c == '\t' c == '\r' c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1 c == ' ' c ' ' c == '\n' c '\n' c == '\r' c '\r' c == '\t' c '\t' c == -1 c -1 1 int c c public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);
        } SpaceCharFilter public boolean isSpaceChar(int ch); isSpaceChar int ch ch public class Main {
    static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private SpaceCharFilter filter;

        public InputReader(InputStream stream) {
            this.stream = stream;
        }

        public int next() {
            if (numChars == -1)
                throw new InputMismatchException();
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        }

        public String nextStr() {
            int c = next();
            while (isSpaceChar(c)) {
                c = next();
            }
            StringBuffer str = new StringBuffer();
            do {
                str.append((char) c);
                c = next();
            } while (!isSpaceChar(c));
            return str.toString();
        }

        public int nextInt() {
            int c = next();
            while (isSpaceChar(c))
                c = next();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = next();
            }
            int res = 0;
            do {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = next();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public boolean isSpaceChar(int c) {
            if (filter != null)
                return filter.isSpaceChar(c);
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);
        }
    }
    private static int binarySearch(int sp2[], int key, int left, int right) {
        int mid = (left + right) / 2;
        if (left > right) {
            return -1;
        }
        if (key==sp2[mid]) {
            return 1;
        } else if (key > sp2[mid]) {
            return binarySearch(sp2, key, mid+1, right);
        } else {
            return binarySearch(sp2, key, left, mid-1);
        }

    }
    public static void main(String[] args) throws IOException {

        InputReader sc = new InputReader(System.in);
        int n1 = sc.nextInt();
        int sp1[] = new int[n1];
        for (int i = 0; i < n1; i++) {
            sp1[i] = sc.nextInt();
        }
        int n2 = sc.nextInt();
        int sp2[] = new int[n1];
        for (int i = 0; i < n2; i++) {
            sp2[i] = sc.nextInt();
        }
        int sum = 0;
        for (int j = 0; j < n2; j++) {
            if (binarySearch(sp1, sp2[j],0,sp1.length) > 0) {
                sum++;
            }
        }
        System.out.println(sum);
    }
} public class Main {
    static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private SpaceCharFilter filter;

        public InputReader(InputStream stream) {
            this.stream = stream;
        }

        public int next() {
            if (numChars == -1)
                throw new InputMismatchException();
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        }

        public String nextStr() {
            int c = next();
            while (isSpaceChar(c)) {
                c = next();
            }
            StringBuffer str = new StringBuffer();
            do {
                str.append((char) c);
                c = next();
            } while (!isSpaceChar(c));
            return str.toString();
        }

        public int nextInt() {
            int c = next();
            while (isSpaceChar(c))
                c = next();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = next();
            }
            int res = 0;
            do {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = next();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public boolean isSpaceChar(int c) {
            if (filter != null)
                return filter.isSpaceChar(c);
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);
        }
    }
    private static int binarySearch(int sp2[], int key, int left, int right) {
        int mid = (left + right) / 2;
        if (left > right) {
            return -1;
        }
        if (key==sp2[mid]) {
            return 1;
        } else if (key > sp2[mid]) {
            return binarySearch(sp2, key, mid+1, right);
        } else {
            return binarySearch(sp2, key, left, mid-1);
        }

    }
    public static void main(String[] args) throws IOException {

        InputReader sc = new InputReader(System.in);
        int n1 = sc.nextInt();
        int sp1[] = new int[n1];
        for (int i = 0; i < n1; i++) {
            sp1[i] = sc.nextInt();
        }
        int n2 = sc.nextInt();
        int sp2[] = new int[n1];
        for (int i = 0; i < n2; i++) {
            sp2[i] = sc.nextInt();
        }
        int sum = 0;
        for (int j = 0; j < n2; j++) {
            if (binarySearch(sp1, sp2[j],0,sp1.length) > 0) {
                sum++;
            }
        }
        System.out.println(sum);
    }
} Main
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.Scanner;

public class Main {
    static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private SpaceCharFilter filter;

        public InputReader(InputStream stream) {
            this.stream = stream;
        }

        public int next() {
            if (numChars == -1)
                throw new InputMismatchException();
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        }

        public String nextStr() {
            int c = next();
            while (isSpaceChar(c)) {
                c = next();
            }
            StringBuffer str = new StringBuffer();
            do {
                str.append((char) c);
                c = next();
            } while (!isSpaceChar(c));
            return str.toString();
        }

        public int nextInt() {
            int c = next();
            while (isSpaceChar(c))
                c = next();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = next();
            }
            int res = 0;
            do {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = next();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public boolean isSpaceChar(int c) {
            if (filter != null)
                return filter.isSpaceChar(c);
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);
        }
    }
    private static int binarySearch(int sp2[], int key, int left, int right) {
        int mid = (left + right) / 2;
        if (left > right) {
            return -1;
        }
        if (key==sp2[mid]) {
            return 1;
        } else if (key > sp2[mid]) {
            return binarySearch(sp2, key, mid+1, right);
        } else {
            return binarySearch(sp2, key, left, mid-1);
        }

    }
    public static void main(String[] args) throws IOException {

        InputReader sc = new InputReader(System.in);
        int n1 = sc.nextInt();
        int sp1[] = new int[n1];
        for (int i = 0; i < n1; i++) {
            sp1[i] = sc.nextInt();
        }
        int n2 = sc.nextInt();
        int sp2[] = new int[n1];
        for (int i = 0; i < n2; i++) {
            sp2[i] = sc.nextInt();
        }
        int sum = 0;
        for (int j = 0; j < n2; j++) {
            if (binarySearch(sp1, sp2[j],0,sp1.length) > 0) {
                sum++;
            }
        }
        System.out.println(sum);
    }
}

