#include "bits/stdc++.h"
using namespace std;
#define int long long
#define rep(i, n) for (int i = 0; i < n; i++)
signed main() {
  int a, b, x;
  cin >> a >> b >> x;
  int p = x / a;
  if (x % a != 0)
    p++;
  cout << p * b << endl;
}