using System;
public class Program
{
static double cubeRoot(double n) {
if (n >= 0)
return Math.Pow(n, (double) 1/3);
else
return -Math.Pow((-n), (double) 1/3);
}
public static void Main() {
double n = 0;
Console.WriteLine(cubeRoot(n));
Console.WriteLine(cubeRoot(16));
Console.WriteLine(cubeRoot(-27));
Console.WriteLine(cubeRoot(64));
}
}
/*
run:
0
2.51984209978975
-3
4
*/