using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    //declaracion

   int n1,n2,n3,n4 ;

        Console.WriteLine("el mayor de 4 numeros");

        //solicitar

        Console.WriteLine("introduce n1");

        n1=Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("introduce n2");

        n2=Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("introduce n3");

        n3=Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("introduce n4");

        n4=Convert.ToInt32(Console.ReadLine());

        //calcular

        if  (n1>n2 & n1>n3 & n1>n4)

        {

            Console.WriteLine("el numero mayor es n1"+n1);

        }

        if (n2>n1 & n2>n3 & n2>n4)

        {

            Console.WriteLine("el numero mayor es n2"+n3);  

        }       

        if (n3>n1 & n3>n2 & n3>n4)

        {

            Console.WriteLine("el numero mayor es n3"+n4);

        }

        if (n4>n1 & n4>n2 & n4>n3)

        {

            Console.WriteLine("el numero mayor es n4"+n4);

        }

    }

}