using System;

public class Program

{

    public static void Main()

    {

    int n1, n2, n3, n4, max, min, sum;

        Console.WriteLine("enter the first number");

        n1=int.Parse(Console.ReadLine());

        Console.WriteLine("enter the second number");

        n2=int.Parse(Console.ReadLine());

        Console.WriteLine("enter the third number");

        n3=int.Parse(Console.ReadLine());

        Console.WriteLine("enter the fourth number");

        n4=int.Parse(Console.ReadLine());

        max=Math.Max(Math.Max(n1,n2),Math.Max(n3,n4));

        min=Math.Min(Math.Min(n1,n2),Math.Min(n3,n4));

        sum=n1*n2*n3*n4;

        Console.WriteLine(maximum number );

    }

}