#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <stack>
#include <algorithm>
#include <string>
#include <map>
#include <iterator>
#include <set>
#include <queue>
#include <bitset>
#include <cassert>

using namespace std;


int main() {

    double A, B;

    cin >> A >> B;

    double C;
    cin >> C;

    cout << fixed << setprecision(7) << (A / B * C) << endl;

    return 0;
}