#include <vector>
#include <iostream>
using namespace std;
int main() {
	int N, M;
	cin >> N >> M;
	vector<int> A(N);
	for (int i = 0; i < N; ++i) {
		cin >> A[i];
	}
	int cont = 0;
	for (int i = 0; i <= N; ++i) {
		if ((i == N || A[i] % 2 == 0) && cont >= 1) {
			if (cont >= M) {
				long long ans = 0;
				for (int j = i - cont; j < i; ++j) {
					ans += A[j];
				}
				cout << ans << endl;
			}
			cont = 0;
		}
		if (i != N && A[i] % 2 == 1) ++cont;
	}
	return 0;
}