using System;

public class Program

{

    public static void Main()

    {

//tim so lon nhat

            int n,i,max,temp;

        Console.WriteLine("Nhap n so : ");

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

        max = 0;

        for( i = 1; i <= n ; i++ )

        {

            Console.WriteLine(" Nhap so n"+i+"=");

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

            if ( max < temp )

                max = temp;

        }

            Console.WriteLine(max);

    }

}