#include<bits/stdc++.h>
#define rep(i, x) for(ll i = 0; i < x; i++)
#define rep2(i, x) for(ll i = 1; i <= x; i++)
#define all(a) (a).begin(),(a).end()
using ll = long long;
using ld = long double;
using namespace std;
signed main() {
  cout << fixed << setprecision(15);
	ld a, b, c; cin >> a >> b >> c;
	cout << a * c / b << endl;
	return 0;
}