using System;

public class Program

{

    public static void Main()

    {

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

        int count = 0;

        int max = int.MinValue;

        while(count< n)

        {

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

            count++;               

        if (num > max)

        {

        max = num;

    }

        }

        Console.WriteLine(max);

    }

}