#include <bits/stdc++.h>

using namespace std;

using ll = long long;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int a, b, c;
    cin >> a >> b >> c;
    double ans = a * c;
    ans /= b;
    cout << fixed << setprecision(15) << ans << "\n";
    return 0;
}