using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        int[] prices = new int[]{7,1,5,3,6,4};

        Console.WriteLine(findProfit(prices));

    }

    public static int findProfit(int[] prices){

        int profit = 0;

        for(int i = 0; i < prices.Length - 1; i++)

        {

            int first = prices[i];

            for(int j = i; j < prices.Length; j++)

            {

                int second = prices[j];

                if(second - first > profit){

                    profit = second - first;

                }

            }

        }

        return profit;

    }

}