func_code_string: #include <bits/stdc++.h>   using namespace std;   int a[110][110];   int main() {     int n, m, i, j;     while (~scanf( %d %d , &n, &m)) {       for (i = 0; i < n; i++)         for (j = 0; j < m; j++) scanf( %d , &a[i]);       if (n & 1) {         cout << n << endl;         continue;       }       int vis;       for (i = 0; i < m; i++) {         for (j = 0, vis = 0; j < n; j++) {           if (a[j][i] != a[n - j - 1][i]) {             vis = 1;             break;           }         }         if (vis) break;       }       if (vis)         cout << n << endl;       else {         while (1) {           n /= 2;           if (n == 1 || (n & 1)) {             cout << n << endl;             break;           }           for (i = 0; i < m; i++) {             for (j = 0, vis = 0; j < n; j++) {               if (a[j][i] != a[n - j - 1][i]) {                 vis = 1;                 break;               }             }             if (vis) break;           }           if (vis) {             cout << n << endl;             break;           }         }       }     }     return 0;   }   