#include <bits/stdc++.h>
using namespace std;
using ld = long double;

int main()
{
	cout << fixed << setprecision(10);
	ios::sync_with_stdio(false), cin.tie(0);
	ld A, B, C;
	cin >> A >> B >> C;
	cout << A * (C / B) << endl;
	return 0;
}