import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.StringTokenizer;

/**
 * Built using CHelper plug-in Actual solution is at the top
 */

public class Main {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		Task solver = new Task();
		solver.solve(1, in, out);
		out.close();
	}

	static class Task {
		public void solve(int testNumber, InputReader in, PrintWriter out) {
			int N = in.nextInt();
			int M = in.nextInt();
			List<Integer> list = new ArrayList<>();
			int tmp = 0;
		    for(int i = 0; i < N; i++) {
		    	tmp = in.nextInt();
		    	for(int j = 0; j < tmp; j++) {
		    		list.add(in.nextInt());
		    	}
		    }
		    int count = 0;
		    int ans = 0;
		    Collections.sort(list);
		    for(int i = 1; i < list.size(); i++) {
		    	if(list.get(i) == list.get(i - 1)) {
		    		count++;
		    		if(count == N - 1) {
		    			ans++;
		    		}
		    	}else {
		    		count = 0;
		    	}
		    }
		    if(N == 1) {
		    	ans = list.size();
		    }
		    out.println(ans);
		}
	}
	static class InputReader {
		public BufferedReader reader;
		public StringTokenizer tokenizer;

		public InputReader(InputStream stream) {
			reader = new BufferedReader(new InputStreamReader(stream), 32768);
			tokenizer = null;
		}

		public String next() {
			while (tokenizer == null || !tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
			return tokenizer.nextToken();
		}

		public int nextInt() {
			return Integer.parseInt(next());
		}
	}
} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.io.InputStreamReader; InputStreamReader java.io import java.io.OutputStream; OutputStream java.io import java.io.PrintWriter; PrintWriter java.io import java.util.ArrayList; ArrayList java.util import java.util.Collections; Collections java.util import java.util.List; List java.util import java.util.StringTokenizer; StringTokenizer java.util public class Main {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		Task solver = new Task();
		solver.solve(1, in, out);
		out.close();
	}

	static class Task {
		public void solve(int testNumber, InputReader in, PrintWriter out) {
			int N = in.nextInt();
			int M = in.nextInt();
			List<Integer> list = new ArrayList<>();
			int tmp = 0;
		    for(int i = 0; i < N; i++) {
		    	tmp = in.nextInt();
		    	for(int j = 0; j < tmp; j++) {
		    		list.add(in.nextInt());
		    	}
		    }
		    int count = 0;
		    int ans = 0;
		    Collections.sort(list);
		    for(int i = 1; i < list.size(); i++) {
		    	if(list.get(i) == list.get(i - 1)) {
		    		count++;
		    		if(count == N - 1) {
		    			ans++;
		    		}
		    	}else {
		    		count = 0;
		    	}
		    }
		    if(N == 1) {
		    	ans = list.size();
		    }
		    out.println(ans);
		}
	}
	static class InputReader {
		public BufferedReader reader;
		public StringTokenizer tokenizer;

		public InputReader(InputStream stream) {
			reader = new BufferedReader(new InputStreamReader(stream), 32768);
			tokenizer = null;
		}

		public String next() {
			while (tokenizer == null || !tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
			return tokenizer.nextToken();
		}

		public int nextInt() {
			return Integer.parseInt(next());
		}
	}
} Main public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		Task solver = new Task();
		solver.solve(1, in, out);
		out.close();
	} main {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		Task solver = new Task();
		solver.solve(1, in, out);
		out.close();
	} InputStream inputStream = System.in; inputStream System.in System System.in OutputStream outputStream = System.out; outputStream System.out System System.out InputReader in = new InputReader(inputStream); in new InputReader(inputStream) PrintWriter out = new PrintWriter(outputStream); out new PrintWriter(outputStream) Task solver = new Task(); solver new Task() solver.solve(1, in, out) solver.solve solver 1 in out out.close() out.close out String[] args args static class Task {
		public void solve(int testNumber, InputReader in, PrintWriter out) {
			int N = in.nextInt();
			int M = in.nextInt();
			List<Integer> list = new ArrayList<>();
			int tmp = 0;
		    for(int i = 0; i < N; i++) {
		    	tmp = in.nextInt();
		    	for(int j = 0; j < tmp; j++) {
		    		list.add(in.nextInt());
		    	}
		    }
		    int count = 0;
		    int ans = 0;
		    Collections.sort(list);
		    for(int i = 1; i < list.size(); i++) {
		    	if(list.get(i) == list.get(i - 1)) {
		    		count++;
		    		if(count == N - 1) {
		    			ans++;
		    		}
		    	}else {
		    		count = 0;
		    	}
		    }
		    if(N == 1) {
		    	ans = list.size();
		    }
		    out.println(ans);
		}
	} Task public void solve(int testNumber, InputReader in, PrintWriter out) {
			int N = in.nextInt();
			int M = in.nextInt();
			List<Integer> list = new ArrayList<>();
			int tmp = 0;
		    for(int i = 0; i < N; i++) {
		    	tmp = in.nextInt();
		    	for(int j = 0; j < tmp; j++) {
		    		list.add(in.nextInt());
		    	}
		    }
		    int count = 0;
		    int ans = 0;
		    Collections.sort(list);
		    for(int i = 1; i < list.size(); i++) {
		    	if(list.get(i) == list.get(i - 1)) {
		    		count++;
		    		if(count == N - 1) {
		    			ans++;
		    		}
		    	}else {
		    		count = 0;
		    	}
		    }
		    if(N == 1) {
		    	ans = list.size();
		    }
		    out.println(ans);
		} solve {
			int N = in.nextInt();
			int M = in.nextInt();
			List<Integer> list = new ArrayList<>();
			int tmp = 0;
		    for(int i = 0; i < N; i++) {
		    	tmp = in.nextInt();
		    	for(int j = 0; j < tmp; j++) {
		    		list.add(in.nextInt());
		    	}
		    }
		    int count = 0;
		    int ans = 0;
		    Collections.sort(list);
		    for(int i = 1; i < list.size(); i++) {
		    	if(list.get(i) == list.get(i - 1)) {
		    		count++;
		    		if(count == N - 1) {
		    			ans++;
		    		}
		    	}else {
		    		count = 0;
		    	}
		    }
		    if(N == 1) {
		    	ans = list.size();
		    }
		    out.println(ans);
		} int N = in.nextInt(); N in.nextInt() in.nextInt in int M = in.nextInt(); M in.nextInt() in.nextInt in List<Integer> list = new ArrayList<>(); list new ArrayList<>() int tmp = 0; tmp 0 for(int i = 0; i < N; i++) {
		    	tmp = in.nextInt();
		    	for(int j = 0; j < tmp; j++) {
		    		list.add(in.nextInt());
		    	}
		    } int i = 0; int i = 0; i 0 i < N i N i++ i++ i {
		    	tmp = in.nextInt();
		    	for(int j = 0; j < tmp; j++) {
		    		list.add(in.nextInt());
		    	}
		    } {
		    	tmp = in.nextInt();
		    	for(int j = 0; j < tmp; j++) {
		    		list.add(in.nextInt());
		    	}
		    } tmp = in.nextInt() tmp in.nextInt() in.nextInt in for(int j = 0; j < tmp; j++) {
		    		list.add(in.nextInt());
		    	} int j = 0; int j = 0; j 0 j < tmp j tmp j++ j++ j {
		    		list.add(in.nextInt());
		    	} {
		    		list.add(in.nextInt());
		    	} list.add(in.nextInt()) list.add list in.nextInt() in.nextInt in int count = 0; count 0 int ans = 0; ans 0 Collections.sort(list) Collections.sort Collections list for(int i = 1; i < list.size(); i++) {
		    	if(list.get(i) == list.get(i - 1)) {
		    		count++;
		    		if(count == N - 1) {
		    			ans++;
		    		}
		    	}else {
		    		count = 0;
		    	}
		    } int i = 1; int i = 1; i 1 i < list.size() i list.size() list.size list i++ i++ i {
		    	if(list.get(i) == list.get(i - 1)) {
		    		count++;
		    		if(count == N - 1) {
		    			ans++;
		    		}
		    	}else {
		    		count = 0;
		    	}
		    } {
		    	if(list.get(i) == list.get(i - 1)) {
		    		count++;
		    		if(count == N - 1) {
		    			ans++;
		    		}
		    	}else {
		    		count = 0;
		    	}
		    } if(list.get(i) == list.get(i - 1)) {
		    		count++;
		    		if(count == N - 1) {
		    			ans++;
		    		}
		    	}else {
		    		count = 0;
		    	} list.get(i) == list.get(i - 1) list.get(i) list.get list i list.get(i - 1) list.get list i - 1 i 1 {
		    		count++;
		    		if(count == N - 1) {
		    			ans++;
		    		}
		    	} count++ count if(count == N - 1) {
		    			ans++;
		    		} count == N - 1 count N - 1 N 1 {
		    			ans++;
		    		} ans++ ans {
		    		count = 0;
		    	} count = 0 count 0 if(N == 1) {
		    	ans = list.size();
		    } N == 1 N 1 {
		    	ans = list.size();
		    } ans = list.size() ans list.size() list.size list out.println(ans) out.println out ans int testNumber testNumber InputReader in in PrintWriter out out static class InputReader {
		public BufferedReader reader;
		public StringTokenizer tokenizer;

		public InputReader(InputStream stream) {
			reader = new BufferedReader(new InputStreamReader(stream), 32768);
			tokenizer = null;
		}

		public String next() {
			while (tokenizer == null || !tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
			return tokenizer.nextToken();
		}

		public int nextInt() {
			return Integer.parseInt(next());
		}
	} InputReader public BufferedReader reader; reader public StringTokenizer tokenizer; tokenizer public InputReader(InputStream stream) {
			reader = new BufferedReader(new InputStreamReader(stream), 32768);
			tokenizer = null;
		} InputReader {
			reader = new BufferedReader(new InputStreamReader(stream), 32768);
			tokenizer = null;
		} reader = new BufferedReader(new InputStreamReader(stream), 32768) reader new BufferedReader(new InputStreamReader(stream), 32768) tokenizer = null tokenizer null InputStream stream stream public String next() {
			while (tokenizer == null || !tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
			return tokenizer.nextToken();
		} next {
			while (tokenizer == null || !tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
			return tokenizer.nextToken();
		} while (tokenizer == null || !tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			} tokenizer == null || !tokenizer.hasMoreTokens() tokenizer == null tokenizer null !tokenizer.hasMoreTokens() tokenizer.hasMoreTokens() tokenizer.hasMoreTokens tokenizer {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			} try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				} catch (IOException e) {
					throw new RuntimeException(e);
				} IOException e {
					throw new RuntimeException(e);
				} throw new RuntimeException(e); new RuntimeException(e) {
					tokenizer = new StringTokenizer(reader.readLine());
				} tokenizer = new StringTokenizer(reader.readLine()) tokenizer new StringTokenizer(reader.readLine()) return tokenizer.nextToken(); tokenizer.nextToken() tokenizer.nextToken tokenizer public int nextInt() {
			return Integer.parseInt(next());
		} nextInt {
			return Integer.parseInt(next());
		} return Integer.parseInt(next()); Integer.parseInt(next()) Integer.parseInt Integer next() next public class Main {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		Task solver = new Task();
		solver.solve(1, in, out);
		out.close();
	}

	static class Task {
		public void solve(int testNumber, InputReader in, PrintWriter out) {
			int N = in.nextInt();
			int M = in.nextInt();
			List<Integer> list = new ArrayList<>();
			int tmp = 0;
		    for(int i = 0; i < N; i++) {
		    	tmp = in.nextInt();
		    	for(int j = 0; j < tmp; j++) {
		    		list.add(in.nextInt());
		    	}
		    }
		    int count = 0;
		    int ans = 0;
		    Collections.sort(list);
		    for(int i = 1; i < list.size(); i++) {
		    	if(list.get(i) == list.get(i - 1)) {
		    		count++;
		    		if(count == N - 1) {
		    			ans++;
		    		}
		    	}else {
		    		count = 0;
		    	}
		    }
		    if(N == 1) {
		    	ans = list.size();
		    }
		    out.println(ans);
		}
	}
	static class InputReader {
		public BufferedReader reader;
		public StringTokenizer tokenizer;

		public InputReader(InputStream stream) {
			reader = new BufferedReader(new InputStreamReader(stream), 32768);
			tokenizer = null;
		}

		public String next() {
			while (tokenizer == null || !tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
			return tokenizer.nextToken();
		}

		public int nextInt() {
			return Integer.parseInt(next());
		}
	}
} public class Main {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		Task solver = new Task();
		solver.solve(1, in, out);
		out.close();
	}

	static class Task {
		public void solve(int testNumber, InputReader in, PrintWriter out) {
			int N = in.nextInt();
			int M = in.nextInt();
			List<Integer> list = new ArrayList<>();
			int tmp = 0;
		    for(int i = 0; i < N; i++) {
		    	tmp = in.nextInt();
		    	for(int j = 0; j < tmp; j++) {
		    		list.add(in.nextInt());
		    	}
		    }
		    int count = 0;
		    int ans = 0;
		    Collections.sort(list);
		    for(int i = 1; i < list.size(); i++) {
		    	if(list.get(i) == list.get(i - 1)) {
		    		count++;
		    		if(count == N - 1) {
		    			ans++;
		    		}
		    	}else {
		    		count = 0;
		    	}
		    }
		    if(N == 1) {
		    	ans = list.size();
		    }
		    out.println(ans);
		}
	}
	static class InputReader {
		public BufferedReader reader;
		public StringTokenizer tokenizer;

		public InputReader(InputStream stream) {
			reader = new BufferedReader(new InputStreamReader(stream), 32768);
			tokenizer = null;
		}

		public String next() {
			while (tokenizer == null || !tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
			return tokenizer.nextToken();
		}

		public int nextInt() {
			return Integer.parseInt(next());
		}
	}
} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.StringTokenizer;

/**
 * Built using CHelper plug-in Actual solution is at the top
 */

public class Main {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		Task solver = new Task();
		solver.solve(1, in, out);
		out.close();
	}

	static class Task {
		public void solve(int testNumber, InputReader in, PrintWriter out) {
			int N = in.nextInt();
			int M = in.nextInt();
			List<Integer> list = new ArrayList<>();
			int tmp = 0;
		    for(int i = 0; i < N; i++) {
		    	tmp = in.nextInt();
		    	for(int j = 0; j < tmp; j++) {
		    		list.add(in.nextInt());
		    	}
		    }
		    int count = 0;
		    int ans = 0;
		    Collections.sort(list);
		    for(int i = 1; i < list.size(); i++) {
		    	if(list.get(i) == list.get(i - 1)) {
		    		count++;
		    		if(count == N - 1) {
		    			ans++;
		    		}
		    	}else {
		    		count = 0;
		    	}
		    }
		    if(N == 1) {
		    	ans = list.size();
		    }
		    out.println(ans);
		}
	}
	static class InputReader {
		public BufferedReader reader;
		public StringTokenizer tokenizer;

		public InputReader(InputStream stream) {
			reader = new BufferedReader(new InputStreamReader(stream), 32768);
			tokenizer = null;
		}

		public String next() {
			while (tokenizer == null || !tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
			return tokenizer.nextToken();
		}

		public int nextInt() {
			return Integer.parseInt(next());
		}
	}
}
