sum even numbers / lists

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

namespace exampreparation
{
    class exam
    {
        static void Main(string[] args)
        {
            List<int> letters = Console.ReadLine().Split().Select(int.Parse).ToList();

            letters.RemoveAll(n => n % 2 == 1);

            Console.WriteLine(letters.Sum());

        }
    }
}