#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main() {
    ios::sync_with_stdio (false);
    cin.tie (nullptr);
    int a, b, x;
    cin >> a >> b >> x;

    if (x % a == 0) {
        int hb = x / a;
        cout << hb*b;
        return 0;
    }

    if (x % a != 0) {
        int hb = (x / a) + 1;
        cout << hb*b;
        return 0;
    }
}