using System;

        using System.Collections.Generic;   

using System.Linq;

public class Program

{

    public static void Main()

    {

        string input = "5, 3 , 8, 1, 4";

        var values = input.Split(',');

        List<int> numbers = new List<int>();

        foreach(var item in values){

            numbers.Add(Convert.ToInt32(item.Trim()));

        }

        int maxNumber = numbers.Max();

        Console.WriteLine(maxNumber);

    }

}