#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <cstring>
#include <cstdlib>
#include <cmath>
using namespace std;
using ll = long long;

int main() {
    int a, b, c;
    cin >> a >> b >> c;


    printf("%.8f\n", (double)a * c / b);

    return 0;
}