import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) throws NumberFormatException, IOException {
		// TODO 自動生成されたメソッド・スタブ
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		
		int n = Integer.parseInt(br.readLine());
		String[] str = br.readLine().split(" ");
		int[] S = new int[n];
		for(int i = 0; i < n; i++){
			S[i] = Integer.parseInt(str[i]);
		}
		
		int q = Integer.parseInt(br.readLine());
		str = br.readLine().split(" ");
		int count = 0;
		for(int i = 0; i < q; i++){
			
			int T = Integer.parseInt(str[i]);
			int left = 0, right = n;
			
			while(right != left){
				int half = (right + left)/2;
				if(S[half] < T){
					left = half + 1;
				} else if(S[half] > T){
					right = half;
				} else {
					count++;
					break;
				}
			}
		}
		System.out.println(count);
	}
} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io public class Main {

	public static void main(String[] args) throws NumberFormatException, IOException {
		// TODO 自動生成されたメソッド・スタブ
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		
		int n = Integer.parseInt(br.readLine());
		String[] str = br.readLine().split(" ");
		int[] S = new int[n];
		for(int i = 0; i < n; i++){
			S[i] = Integer.parseInt(str[i]);
		}
		
		int q = Integer.parseInt(br.readLine());
		str = br.readLine().split(" ");
		int count = 0;
		for(int i = 0; i < q; i++){
			
			int T = Integer.parseInt(str[i]);
			int left = 0, right = n;
			
			while(right != left){
				int half = (right + left)/2;
				if(S[half] < T){
					left = half + 1;
				} else if(S[half] > T){
					right = half;
				} else {
					count++;
					break;
				}
			}
		}
		System.out.println(count);
	}
} Main public static void main(String[] args) throws NumberFormatException, IOException {
		// TODO 自動生成されたメソッド・スタブ
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		
		int n = Integer.parseInt(br.readLine());
		String[] str = br.readLine().split(" ");
		int[] S = new int[n];
		for(int i = 0; i < n; i++){
			S[i] = Integer.parseInt(str[i]);
		}
		
		int q = Integer.parseInt(br.readLine());
		str = br.readLine().split(" ");
		int count = 0;
		for(int i = 0; i < q; i++){
			
			int T = Integer.parseInt(str[i]);
			int left = 0, right = n;
			
			while(right != left){
				int half = (right + left)/2;
				if(S[half] < T){
					left = half + 1;
				} else if(S[half] > T){
					right = half;
				} else {
					count++;
					break;
				}
			}
		}
		System.out.println(count);
	} main {
		// TODO 自動生成されたメソッド・スタブ
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		
		int n = Integer.parseInt(br.readLine());
		String[] str = br.readLine().split(" ");
		int[] S = new int[n];
		for(int i = 0; i < n; i++){
			S[i] = Integer.parseInt(str[i]);
		}
		
		int q = Integer.parseInt(br.readLine());
		str = br.readLine().split(" ");
		int count = 0;
		for(int i = 0; i < q; i++){
			
			int T = Integer.parseInt(str[i]);
			int left = 0, right = n;
			
			while(right != left){
				int half = (right + left)/2;
				if(S[half] < T){
					left = half + 1;
				} else if(S[half] > T){
					right = half;
				} else {
					count++;
					break;
				}
			}
		}
		System.out.println(count);
	} BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) int n = Integer.parseInt(br.readLine()); n Integer.parseInt(br.readLine()) Integer.parseInt Integer br.readLine() br.readLine br String[] str = br.readLine().split(" "); str br.readLine().split(" ") br.readLine().split br.readLine() br.readLine br " " int[] S = new int[n]; S new int[n] n for(int i = 0; i < n; i++){
			S[i] = Integer.parseInt(str[i]);
		} int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
			S[i] = Integer.parseInt(str[i]);
		} {
			S[i] = Integer.parseInt(str[i]);
		} S[i] = Integer.parseInt(str[i]) S[i] S i Integer.parseInt(str[i]) Integer.parseInt Integer str[i] str i int q = Integer.parseInt(br.readLine()); q Integer.parseInt(br.readLine()) Integer.parseInt Integer br.readLine() br.readLine br str = br.readLine().split(" ") str br.readLine().split(" ") br.readLine().split br.readLine() br.readLine br " " int count = 0; count 0 for(int i = 0; i < q; i++){
			
			int T = Integer.parseInt(str[i]);
			int left = 0, right = n;
			
			while(right != left){
				int half = (right + left)/2;
				if(S[half] < T){
					left = half + 1;
				} else if(S[half] > T){
					right = half;
				} else {
					count++;
					break;
				}
			}
		} int i = 0; int i = 0; i 0 i < q i q i++ i++ i {
			
			int T = Integer.parseInt(str[i]);
			int left = 0, right = n;
			
			while(right != left){
				int half = (right + left)/2;
				if(S[half] < T){
					left = half + 1;
				} else if(S[half] > T){
					right = half;
				} else {
					count++;
					break;
				}
			}
		} {
			
			int T = Integer.parseInt(str[i]);
			int left = 0, right = n;
			
			while(right != left){
				int half = (right + left)/2;
				if(S[half] < T){
					left = half + 1;
				} else if(S[half] > T){
					right = half;
				} else {
					count++;
					break;
				}
			}
		} int T = Integer.parseInt(str[i]); T Integer.parseInt(str[i]) Integer.parseInt Integer str[i] str i int left = 0 left 0 right = n; right n while(right != left){
				int half = (right + left)/2;
				if(S[half] < T){
					left = half + 1;
				} else if(S[half] > T){
					right = half;
				} else {
					count++;
					break;
				}
			} right != left right left {
				int half = (right + left)/2;
				if(S[half] < T){
					left = half + 1;
				} else if(S[half] > T){
					right = half;
				} else {
					count++;
					break;
				}
			} int half = (right + left)/2; half (right + left)/2 (right + left) right left 2 if(S[half] < T){
					left = half + 1;
				} else if(S[half] > T){
					right = half;
				} else {
					count++;
					break;
				} S[half] < T S[half] S half T {
					left = half + 1;
				} left = half + 1 left half + 1 half 1 if(S[half] > T){
					right = half;
				} else {
					count++;
					break;
				} S[half] > T S[half] S half T {
					right = half;
				} right = half right half {
					count++;
					break;
				} count++ count break; System.out.println(count) System.out.println System.out System System.out count String[] args args public class Main {

	public static void main(String[] args) throws NumberFormatException, IOException {
		// TODO 自動生成されたメソッド・スタブ
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		
		int n = Integer.parseInt(br.readLine());
		String[] str = br.readLine().split(" ");
		int[] S = new int[n];
		for(int i = 0; i < n; i++){
			S[i] = Integer.parseInt(str[i]);
		}
		
		int q = Integer.parseInt(br.readLine());
		str = br.readLine().split(" ");
		int count = 0;
		for(int i = 0; i < q; i++){
			
			int T = Integer.parseInt(str[i]);
			int left = 0, right = n;
			
			while(right != left){
				int half = (right + left)/2;
				if(S[half] < T){
					left = half + 1;
				} else if(S[half] > T){
					right = half;
				} else {
					count++;
					break;
				}
			}
		}
		System.out.println(count);
	}
} public class Main {

	public static void main(String[] args) throws NumberFormatException, IOException {
		// TODO 自動生成されたメソッド・スタブ
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		
		int n = Integer.parseInt(br.readLine());
		String[] str = br.readLine().split(" ");
		int[] S = new int[n];
		for(int i = 0; i < n; i++){
			S[i] = Integer.parseInt(str[i]);
		}
		
		int q = Integer.parseInt(br.readLine());
		str = br.readLine().split(" ");
		int count = 0;
		for(int i = 0; i < q; i++){
			
			int T = Integer.parseInt(str[i]);
			int left = 0, right = n;
			
			while(right != left){
				int half = (right + left)/2;
				if(S[half] < T){
					left = half + 1;
				} else if(S[half] > T){
					right = half;
				} else {
					count++;
					break;
				}
			}
		}
		System.out.println(count);
	}
} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) throws NumberFormatException, IOException {
		// TODO 自動生成されたメソッド・スタブ
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		
		int n = Integer.parseInt(br.readLine());
		String[] str = br.readLine().split(" ");
		int[] S = new int[n];
		for(int i = 0; i < n; i++){
			S[i] = Integer.parseInt(str[i]);
		}
		
		int q = Integer.parseInt(br.readLine());
		str = br.readLine().split(" ");
		int count = 0;
		for(int i = 0; i < q; i++){
			
			int T = Integer.parseInt(str[i]);
			int left = 0, right = n;
			
			while(right != left){
				int half = (right + left)/2;
				if(S[half] < T){
					left = half + 1;
				} else if(S[half] > T){
					right = half;
				} else {
					count++;
					break;
				}
			}
		}
		System.out.println(count);
	}
}
