Taikula

#include <bits/stdc++.h>
using namespace std;
const double pi = 3.14;
int main(){
    int s, t1, t2;
    cin >> s >> t1 >> t2;
    double ball = s * 1.0 / t1 * t2;
    double num = ball * 3 / 4 / pi;
    double r = pow(num, 1.0 / 3);
    cout << fixed << setprecision(2) << r;
    return 0;
}