// editor4
#include<stdio.h>
int main(){
    int m,n;
    scanf("%d %d", &m,&n);
    int matrix[m][n];
    for(int i=0;i<m;i++){
        for(int j=0;j<n;j++){
            scanf("%d", &matrix[i][j]);
        }
    }
    int target;
    scanf("%d", &target);
    int found = 0;
    for(int i=0;i<m;i++){
        for(int j=0;j<n;j++){
            if(matrix[i][j] == target){
                found = 1;
                brek;
            }
        }
        if(found) break;
    }
    if(found)
    printf("true");
    else
    printf("false");
    return 0;
    
}