using System;

namespace Task6_MinNumber
{
    class MinNumber
    {
        static void Main(string[] args)
        {
            int numberOfNumbers = int.Parse(Console.ReadLine());
            double greatestNumber = double.MinValue;
            for (int i = 0; i < numberOfNumbers; i++)
            {
                double currentNumber = double.Parse(Console.ReadLine());
                if (currentNumber > greatestNumber)
                {
                    greatestNumber = currentNumber;
                }
            }
            Console.WriteLine(greatestNumber);
        }
    }
}