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

namespace _05BombNumbers
{
    class Program
    {
        static void Main(string[] args)
        {
            List<int> numbers = Console.ReadLine().Split().Select(int.Parse).ToList();
            List<int> combination = Console.ReadLine().Split().Select(int.Parse).ToList();

            int bombNumber = combination[0];
            int power = combination[1];
            int index = numbers.IndexOf(bombNumber);

            while (index != -1)
            {
                int startIndex = Math.Max(0, index - power);
                int count = Math.Min(power * 2 + 1, numbers.Count - startIndex);
                numbers.RemoveRange(startIndex, count);
                index = numbers.IndexOf(bombNumber);
            }

            Console.WriteLine(numbers.Sum());
        }
    }
}