#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for(int i=0; i<n; i++)
#define debug 0
#define YES cout << "Yes" << endl;
#define NO cout << "No" << endl;
using ll = long long;
using ld = long double;
const int mod = 998244353;
const int MOD = 1000000007;
const double pi = atan2(0, -1);
#include <time.h>
#include <chrono>

int main() {
	int a, b, x;
	cin >> a >> b >> x;
	int ans = 0;
	int now = 0;
	while (now < x) {
		ans += b;
		now += a;
	}
	cout << ans << endl;
}