func_code_string: #include <bits/stdc++.h>   using namespace std;   long long N, M;   struct MATRIX {     int dim;     long long MAT[100][100];     MATRIX(int N, int x = -1) {       dim = N;       for (int i = 0; i < dim; i++)         for (int j = 0; j < dim; j++) {           if (x != -1 && i == j)             MAT[i][j] = x;           else             MAT[i][j] = 0;         }     }     void operator+=(const MATRIX& a) {       for (int i = 0; i < a.dim; i++) {         for (int j = 0; j < a.dim; j++) {           MAT[i][j] += a.MAT[i][j];         }       }     }     void show() {       for (int i = 0; i < dim; i++) {         for (int j = 0; j < dim; j++) cout << MAT[i][j] <<    ;         cout << endl;       }       cout << endl;     }   };   MATRIX operator*(MATRIX a, MATRIX b) {     MATRIX res(a.dim);     for (int i = 0; i < a.dim; i++) {       for (int j = 0; j < b.dim; j++) {         long long sum = 0;         for (int z = 0; z < a.dim; z++) {           sum += a.MAT[i][z] * b.MAT[z][j];         }         sum %= M;         res.MAT[i][j] = sum;       }     }     return res;   }   MATRIX binpow(MATRIX a, long long n) {     MATRIX res = a;     while (n) {       if (n & 1) res = res * a;       a = a * a;       n >>= 1;     }     return res;   }   int main() {     int X;     cin >> N >> X;     for (int i = 0; i < N; i++) {       int a, b;       cin >> a >> b;       if (a == 7 - X || b == 7 - X || a == X || b == X) {         cout <<  NO ;         return 0;       }     }     cout <<  YES ;     return 0;   }   