import java.util.*;
public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int k = sc.nextInt();
        int[] s = new int[n];
        Arrays.fill(s , 0);
        for(int i = 0 ; i < k ; i++){
            int d = sc.nextInt();
            int[] a = new int[d];
            for(int j = 0 ; j < d ; j++){
                a[j] = sc.nextInt() - 1;
                s[a[j]]++;
            } 
        }
        sc.close();
        Arrays.sort(s);
        int yono = 0;
        while(s[yono] == 0){
            yono++;
        }
        System.out.println(yono);
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz