func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MAX = 105;   int main() {     ios::sync_with_stdio(false);     int n;     cin >> n;     int x;     cin >> x;     for (int i = 0; i < n; i++) {       x = 7 - x;       int a, b;       cin >> a >> b;       if (a == x || b == x || 7 - a == x || 7 - b == x) {         cout <<  NO n ;         return 0;       }       for (int j = 1; j <= 6; j++)         if (a != j && b != j && 7 - a != j && 7 - b != j) x = j;     }     cout <<  YES n ;     return 0;   }   