#include <iostream>
#include <cmath>
using namespace std;
double c3(double x)
{
if (x >= 0) return pow(x,1./3.);
else return -pow(-x,1./3.);
}
int main() {
cout << c3(-9);
}
I2luY2x1ZGUgPGlvc3RyZWFtPgojaW5jbHVkZSA8Y21hdGg+CnVzaW5nIG5hbWVzcGFjZSBzdGQ7Cgpkb3VibGUgYzMoZG91YmxlIHgpCnsKaWYgKHggPj0gMCkgcmV0dXJuIHBvdyh4LDEuLzMuKTsKZWxzZSByZXR1cm4gLXBvdygteCwxLi8zLik7CQp9CgoKaW50IG1haW4oKSB7Cgljb3V0IDw8IGMzKC05KTsKfQ==