#include <bits/stdc++.h>
using namespace std;
 
// The GOAT ^_^
int main() {
  int n, m;
  cin >> n >> m;
  int arr[n][m];
 
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < m; j++) {
      cin >> arr[i][j];
    }
  }
 
  int x;
  cin >> x;
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < m; j++) {
      if (arr[i][j] == x) {
        cout << "YES" << endl;
        return 0;
      }
    }
  }
  cout << "NO" << endl;
  return 0;
}

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MiAyCjEgMgozIDQKMTAK

2 2
1 2
3 4
10