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