package L14ListExercises;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

public class Ex07BombNumbres {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        List<Integer> numbers = Arrays.stream(reader.readLine().split("\\s+"))
                .map(Integer::parseInt)
                .collect(Collectors.toCollection(ArrayList::new));
        int[] parameters = Arrays.stream(reader.readLine().split("\\s+"))
                .mapToInt(Integer::parseInt)
                .toArray();
        int element = parameters[0];
        int power = parameters[1];

        while (numbers.contains(element)) {
            int index = numbers.indexOf(element);
            int leftLimit = Math.max(0, index - power);
            int rightLimit = Math.min(numbers.size() - 1, index + power);
            for (int j = rightLimit; j >= leftLimit; j--) {
                numbers.remove(j);
            }
        }

        int sum = 0;
        for (Integer number : numbers) {
            sum += number;
        }
        System.out.println(sum);
    }
}