#include <bits/stdc++.h>
using namespace std;

int main()
{
//    freopen("test.inp","r",stdin);
//freopen("test.out","w",stdout);
    int a,b,x;
    cin >>a >>b >>x;
    bool check = false;
    if(x < a) cout <<b;
    else{
        if(x % a != 0) check = true;
        cout <<(x/a + check)*b;
    }
    
    return 0;
}