#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 = sin(mint);
  res = pow(res1, 1 / 3.);

  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;
}