using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _07.Bomb_Numbers
{
    class Program
    {
        static void Main(string[] args)
        {
            List<int> field = Console.ReadLine()
                .Split(' ')
                .Select(int.Parse)
                .ToList();
            List<int> bomb = Console.ReadLine()
                .Split(' ')
                .Select(int.Parse)
                .ToList();



            for (int i = 0; i < field.Count; i++)
            {
                if (field[i] == bomb[0])
                {
                    int start = Math.Abs(i - bomb[1]);
                    int end = Math.Abs(bomb[1] * 2 + 1);
                    if (i > field.Count/2)
                    {
                        end = Math.Abs((field.Count - i ) + bomb[1]);
                        field.RemoveRange(start, end);
                    }
                    else if (start <= 0)
                    {
                        field.RemoveRange(0, end);
                    }
                    else
                    {
                        field.RemoveRange(start, end);
                    }
                }
            }
            //Console.WriteLine(String.Join(" ",field));
            Console.WriteLine(field.Sum());
        }
    }
}