#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  int n, m;
  cin >> n >> m;
  vector<int> a(n);
  rep(i, n) cin >> a[i];
  vector<tuple<int, int, ll>> rle(1, { a[0] % 2, 0, 0 });
  rep(i, n) {
    if (get<0>(rle.back()) == a[i] % 2) {
      get<1>(rle.back())++;
      get<2>(rle.back()) += a[i];
    }
    else {
      rle.push_back({ a[i] % 2, 1, a[i] });
    }
  }
  for (auto [parity, cnt, sum] : rle) {
    if (parity == 1 && cnt >= m) cout << sum << endl;
  }
  return 0;
}