using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
int n = Console.Read();
var list = new List<int>();
for(int i = 0; i < n; i++){
list.Add(Console.Read());
}
Console.WriteLine(list.Max());
}
}
}