/*

*/
#include <bits/stdc++.h>

using namespace std;
using ll = long long;

#define rep(i, n) for(int i = 0; i < (int)(n); i++)

int main(){

  int a, b, x;
  cin >> a >> b >> x;

  int t;
  if(x%a == 0){
    t = x/a;
  }else{
    t = x/a + 1;
  }
  int sum = b * t;

  cout << sum << endl;

  return 0;
}