using System;

public class Program

{

    public static void Main()

    {

        //Declaracion

        int n1,n2,n3,n4;

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

        //Solicitar

        Console.WriteLine("Introduce n1");

        Console.WriteLine("Introduce n2");

        Console.WriteLine("Introduce n3");

        Console.WriteLine("Introduce n4");

        //leer

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

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

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

        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="+n2);

        }

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

        {

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

        }

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

        {

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

        }

    }

}