#include <iostream>
#include "cmath"
using namespace std;
double func(const double a,const double b,const double c)
{
    double pervoe,vtoroe,govnishe,gov1,pizdec,pizdec2,gov2,res,qub,qvr;
    qub = b*b*b;
    qvr = a*a;
    pervoe = qvr-qub;
    pizdec = a*c;

    vtoroe = fabs(pizdec);
    pizdec2 = b*b;
    govnishe = sqrt(vtoroe + b*b);
    gov1 = sin(pervoe);
    gov2 = gov1 - govnishe;
    res = pow(gov2, 1.0/3.0);
    return res;
}
    int main()
{
    double A,B,C,result;
    while(true)
    {
        cout << "\t Введите ваше говнище по порядку,пж \n";
        cin >> A >> B >> C;
        result = func(A,B,C);
        cout << result << endl;

    }
    return 0;
}