func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long t;     t = 1;     while (t--) {       long long n, m;       cin >> n;       cin >> m;       string s[n];       for (long long i = 0; i < n; i++) {         string cur =   ;         for (long long i = 0; i < m; i++) {           long long k;           cin >> k;           cur += to_string(k);         }         s[i] = cur;       }       if (n & 1)         cout << n << endl;       else {         long long ans = n;         while (n % 2 == 0) {           n = n / 2;           bool flag = 1;           for (long long i = 0; i < n; i++) {             if (s[i] != s[2 * n - i - 1]) {               flag = 0;               break;             }           }           if (!flag)             break;           else             ans = n;         }         cout << ans << endl;       }     }     return 0;   }   