import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		//List<String> list= new ArrayList<String>(Arrays.asList(s.split("")));
		//List<Integer> list=new ArrayList<Integer>();
		int n = sc.nextInt();
		int m = sc.nextInt();
		Integer[] array = new Integer[m];
		for(int i=0;m>i;i++) {
			array[i] = 0;
		}
		for(int i=0;n>i;i++) {
			int k = sc.nextInt();
			for(int j=0;k>j;j++) {
				int a = sc.nextInt();
				array[a-1] = array[a-1]+1;
			}
		}
		int count=0;

		for(int i=0;m>i;i++) {
			if(array[i]>n-1)
				count++;
		}
		System.out.println(count);
	}
}

 import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		//List<String> list= new ArrayList<String>(Arrays.asList(s.split("")));
		//List<Integer> list=new ArrayList<Integer>();
		int n = sc.nextInt();
		int m = sc.nextInt();
		Integer[] array = new Integer[m];
		for(int i=0;m>i;i++) {
			array[i] = 0;
		}
		for(int i=0;n>i;i++) {
			int k = sc.nextInt();
			for(int j=0;k>j;j++) {
				int a = sc.nextInt();
				array[a-1] = array[a-1]+1;
			}
		}
		int count=0;

		for(int i=0;m>i;i++) {
			if(array[i]>n-1)
				count++;
		}
		System.out.println(count);
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		//List<String> list= new ArrayList<String>(Arrays.asList(s.split("")));
		//List<Integer> list=new ArrayList<Integer>();
		int n = sc.nextInt();
		int m = sc.nextInt();
		Integer[] array = new Integer[m];
		for(int i=0;m>i;i++) {
			array[i] = 0;
		}
		for(int i=0;n>i;i++) {
			int k = sc.nextInt();
			for(int j=0;k>j;j++) {
				int a = sc.nextInt();
				array[a-1] = array[a-1]+1;
			}
		}
		int count=0;

		for(int i=0;m>i;i++) {
			if(array[i]>n-1)
				count++;
		}
		System.out.println(count);
	} main {
		Scanner sc = new Scanner(System.in);
		//List<String> list= new ArrayList<String>(Arrays.asList(s.split("")));
		//List<Integer> list=new ArrayList<Integer>();
		int n = sc.nextInt();
		int m = sc.nextInt();
		Integer[] array = new Integer[m];
		for(int i=0;m>i;i++) {
			array[i] = 0;
		}
		for(int i=0;n>i;i++) {
			int k = sc.nextInt();
			for(int j=0;k>j;j++) {
				int a = sc.nextInt();
				array[a-1] = array[a-1]+1;
			}
		}
		int count=0;

		for(int i=0;m>i;i++) {
			if(array[i]>n-1)
				count++;
		}
		System.out.println(count);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int n = sc.nextInt(); n sc.nextInt() sc.nextInt sc int m = sc.nextInt(); m sc.nextInt() sc.nextInt sc Integer[] array = new Integer[m]; array new Integer[m] m for(int i=0;m>i;i++) {
			array[i] = 0;
		} int i=0; int i=0; i 0 m>i m i i++ i++ i {
			array[i] = 0;
		} {
			array[i] = 0;
		} array[i] = 0 array[i] array i 0 for(int i=0;n>i;i++) {
			int k = sc.nextInt();
			for(int j=0;k>j;j++) {
				int a = sc.nextInt();
				array[a-1] = array[a-1]+1;
			}
		} int i=0; int i=0; i 0 n>i n i i++ i++ i {
			int k = sc.nextInt();
			for(int j=0;k>j;j++) {
				int a = sc.nextInt();
				array[a-1] = array[a-1]+1;
			}
		} {
			int k = sc.nextInt();
			for(int j=0;k>j;j++) {
				int a = sc.nextInt();
				array[a-1] = array[a-1]+1;
			}
		} int k = sc.nextInt(); k sc.nextInt() sc.nextInt sc for(int j=0;k>j;j++) {
				int a = sc.nextInt();
				array[a-1] = array[a-1]+1;
			} int j=0; int j=0; j 0 k>j k j j++ j++ j {
				int a = sc.nextInt();
				array[a-1] = array[a-1]+1;
			} {
				int a = sc.nextInt();
				array[a-1] = array[a-1]+1;
			} int a = sc.nextInt(); a sc.nextInt() sc.nextInt sc array[a-1] = array[a-1]+1 array[a-1] array a-1 a 1 array[a-1]+1 array[a-1] array a-1 a 1 1 int count=0; count 0 for(int i=0;m>i;i++) {
			if(array[i]>n-1)
				count++;
		} int i=0; int i=0; i 0 m>i m i i++ i++ i {
			if(array[i]>n-1)
				count++;
		} {
			if(array[i]>n-1)
				count++;
		} if(array[i]>n-1)
				count++; array[i]>n-1 array[i] array i n-1 n 1 count++ count 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) {
		Scanner sc = new Scanner(System.in);
		//List<String> list= new ArrayList<String>(Arrays.asList(s.split("")));
		//List<Integer> list=new ArrayList<Integer>();
		int n = sc.nextInt();
		int m = sc.nextInt();
		Integer[] array = new Integer[m];
		for(int i=0;m>i;i++) {
			array[i] = 0;
		}
		for(int i=0;n>i;i++) {
			int k = sc.nextInt();
			for(int j=0;k>j;j++) {
				int a = sc.nextInt();
				array[a-1] = array[a-1]+1;
			}
		}
		int count=0;

		for(int i=0;m>i;i++) {
			if(array[i]>n-1)
				count++;
		}
		System.out.println(count);
	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		//List<String> list= new ArrayList<String>(Arrays.asList(s.split("")));
		//List<Integer> list=new ArrayList<Integer>();
		int n = sc.nextInt();
		int m = sc.nextInt();
		Integer[] array = new Integer[m];
		for(int i=0;m>i;i++) {
			array[i] = 0;
		}
		for(int i=0;n>i;i++) {
			int k = sc.nextInt();
			for(int j=0;k>j;j++) {
				int a = sc.nextInt();
				array[a-1] = array[a-1]+1;
			}
		}
		int count=0;

		for(int i=0;m>i;i++) {
			if(array[i]>n-1)
				count++;
		}
		System.out.println(count);
	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		//List<String> list= new ArrayList<String>(Arrays.asList(s.split("")));
		//List<Integer> list=new ArrayList<Integer>();
		int n = sc.nextInt();
		int m = sc.nextInt();
		Integer[] array = new Integer[m];
		for(int i=0;m>i;i++) {
			array[i] = 0;
		}
		for(int i=0;n>i;i++) {
			int k = sc.nextInt();
			for(int j=0;k>j;j++) {
				int a = sc.nextInt();
				array[a-1] = array[a-1]+1;
			}
		}
		int count=0;

		for(int i=0;m>i;i++) {
			if(array[i]>n-1)
				count++;
		}
		System.out.println(count);
	}
}


