import java.util.*;
public class Main {

  public static void main(String[] args) { 
      Scanner sc = new Scanner(System.in);
      int n = sc.nextInt();
      int m = sc.nextInt();
      int[] arr = new int[n];
      for(int i = 0; i < n; i++)
        arr[i] = sc.nextInt();
      int leftIdx = 0;
      long sum = 0L;
      for(int i = 0; i < n; i++) {
        if(arr[i] % 2 == 1) {
          sum += arr[i];
        } else {
          if(i - leftIdx >= m)
            System.out.println(sum);
          sum = 0L;
          leftIdx = i + 1;
        }
      }
      if(n - leftIdx >= m)
        System.out.println(sum);
  }
}