import java. util. Scanner;

public class Main{
	public static void main (String[] args){
		Scanner scanner = new Scanner (System. in);
		int[] number = new int[2];
		
		for (int j = 0; j < number. length; j ++){
			number[j] = scanner. nextInt();
		}
		
		long[] point = new long[number[0]];
		
		for (int j = 0; j < number[0]; j ++){
			point[j] = scanner. nextLong();
		}
		int answer = 0;
		long x = 0;
		for (int j = 0; j <= number[0] - number[1]; j ++){
			for (int k = 0; k < number[1]; k ++){
				if (point[j + k] % 2 == 0){
					answer = 1;
				}
			}
			if (answer == 1){
				if (x != 0){
					System. out. println (x);
				}
				answer = 0;
				x = 0;
				continue;
			}
			for (int k = 0; k < number[1]; k ++){
				x += point[j + k];
					
			}
		}
		if (x != 0){
			System. out. println (x);
		}
		scanner. close();
	}		
}