func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n, m;     cin >> n >> m;     assert(n >= 1 && n <= 10000 && m >= 1 && m <= 10);     if (n == m && (n == 1 || n == 2))       cout << n << endl;     else {       if (n == m)         cout << n << endl;       else {         int t2 = 0, t1 = 0;         if (n & 1) {           n--;           t1++;         }         t2 = n / 2;         while ((t2 + t1) % m != 0 && n > 0) {           n = n - 2;           t1 = t1 + 2;           t2 = n / 2;         }         if (n == 0)           cout << -1 << endl;         else           cout << t1 + t2 << endl;       }     }     return 0;   }   