func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long n, m, k;     cin >> n >> m >> k;     long long l = 0, h = n * m + 2;     while (l < h) {       long long md = (l + h) / 2;       long long rs = 0;       for (int i = 1; i <= n; i++) rs += min(m, md / i);       if (rs < k)         l = md + 1;       else         h = md;     }     cout << l << endl;   }   