func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long n, m, k, t;     cin >> n >> m >> k;     if (k > n + m - 2)       cout <<  -1 n ;     else {       if (k < max(n, m))         cout << max(n * (m / (k + 1)), m * (n / (k + 1))) << endl;       else         cout << max(m / (k - n + 2), n / (k - m + 2)) << endl;     }     return 0;   }   