#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <math.h>
#include <queue>
#include <numeric>
#include <map>
#include <atcoder/all>
using namespace atcoder;
using namespace std;

using ll = long long;

#define Sort(a) sort((a).begin(), (a).end())
#define Rev(a) reverse((a).begin(), (a).end())
#define cfs(a) cout << fixed << setprecision(a)

int main()
{
    ll A, B, X;
    cin >> A >> B >> X;
    ll ans =  B * (X / A);
    if (X % A != 0)
    {
        ans += B;
    }
    cout << ans << endl;
}