using System;

namespace MaxNumber
{
    class Program
    {
        static void Main(string[] args)
        {
            int totalNumbers = int.Parse(Console.ReadLine());
            int input = 0;

            int min = int.MinValue;
            int counter = 0;

            while(counter < totalNumbers)

            {
                input = int.Parse(Console.ReadLine());

                if (input > min)
                    min = input;

                counter++;
            }
            Console.WriteLine(min);
        }
    }
}