using System;
public class Program
{
public static void Main()
Console.WriteLine("Hello World");
double a = 0;
Console.WriteLine(Math.Log(a));
Console.WriteLine(Math.Cbrt(125));
Console.WriteLine(Math.Truncate(200000.999999));
double e = 1000000000000000;
int b = 052;
double c = -55555;
Console.WriteLine(Math.Sign(e));
}