#include <iostream>
#include "math.h"
using namespace std;
double func(double a,double b,double c)
{
    double pervoe,vtoroe,qub,mod,mint,res1;
    double res;
    vtoroe = a*a;
    qub = b*b*b;
    if (vtoroe-qub == 0)
        pervoe = 0;
    else
        pervoe = sin(vtoroe-qub);
    mod = sqrt(fabs(a*c)+(b*b));
    mint = pervoe - mod;
    res1 = abs(sin(mint));
    res = pow(res1,1/3.);

    return res;

}
    int main()
{
    double A,B,C,result;
    while(true)
    {
        cout << "\t Введите значения: \n";
        cin >> A >> B >> C;
        result = func(A,B,C);
        cout << result << endl;

    }
    return 0;
}