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

namespace Bomb
{
    class Program
    {
        static void Main(string[] args)
        {
            var myList = Console.ReadLine().Split().Select(int.Parse).ToList();

            int[] commands = Console.ReadLine().Split().Select(int.Parse).ToArray();

            int specialNum = commands[0];

            int range = commands[1];


            for (int i = 0; i < myList.Count; i++)
            {
                if (myList[i]==specialNum)
                {
                    if (i-range<0)
                    {
                        for (int x = 0; x < i; x++)
                        {
                            myList[x] = 0;
                        }
                        for (int y = i; y <= i + range; y++)
                        {
                            myList[y] = 0;
                        }
                    }
                    else if (i+range > myList.Count-1)
                    {
                        for (int x = myList.Count-1; x >= i ; x--)
                        {
                            myList[x] = 0;

                        }
                        for (int y = i; y >= i - range; y--)
                        {
                            myList[y] = 0;
                        }
                    }
                    else
                    {
                        myList.RemoveRange(i - range, range * 2 + 1);
                    }

                }
            }

            int sum = myList.Sum();
            Console.WriteLine(sum);
        }
    }
}