#include <vector>
#include <iostream>
#include <string>
#include <ostream>
#include <map>
#include <set>
#include <bitset>
#include <cmath>
#include <iomanip>
#include <algorithm>
#include <list>
#define rep(i, n) for (int i = 0; i < (n); i++)
using namespace std;

int main()
{
    int a, b, x;
    cin >> a >> b >> x;
    if (x == a)
        cout << b;
    else if(x > a && x%a!=0)cout << (x/a+1)*b;
    else if(x > a)cout << (x/a)*b;
    else cout << b;
}