using System;
using System.Collections.Generic;
using System.Linq;
using static System.Console;

class Program
{
    static void Main()
    {
        var NM = ReadLine().Split();
        var N = int.Parse(NM[0]);
        var M = int.Parse(NM[1]);
        var A = (ReadLine()).Split().Select(int.Parse).ToArray();

        var sum = new long[N + 1];
        for (int i = 0; i < N; i++)
        {
            sum[i + 1] = sum[i] + A[i];
        }

        var t = 0;
        var p = false;
        for (int s = 0; s < N; s++)
        {
            if (A[s] % 2 == 1)
            {

                if (p)
                {
                    p = true;
                }
                else
                {
                    t = s;
                    p = true;
                }
            }
            else
            {
                if (p)
                {
                    if (s - t + 1 >= M) WriteLine(sum[s] - sum[t]);
                    t = s;
                    p = false;
                }
                else
                {
                    t = s;
                    p = false;

                }
            }
        }
        if(p) if (N - t >= M) WriteLine(sum[N] - sum[t]);
    }
}