using System;

​

public class Program

{

    public static void Main()

    {

        long l1 = -9223372036854775808;

        long l2 = 9223372036854775807;

        ulong ul1 = 18223372036854775808ul;

        ulong ul2 = 18223372036854775808UL;

        Console.WriteLine(Int64.MaxValue); 

        Console.WriteLine(Int64.MinValue); 

        Console.WriteLine(UInt64.MaxValue);

        Console.WriteLine(UInt64.MinValue);

    }

}