#include <bits/stdc++.h>

using namespace std;

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n, k;
	cin >> n >> k;
	vector<int> s(n - k + 1);
	for (int i = 0; i < n - k + 1; ++i) {
		cin >> s[i];
	}
	int ans = 0;
	for (int mask = 0; mask < (1 << n); ++mask) {
		vector<int> a(n);
		for (int i = 0; i < n; ++i) {
			a[i] = ((mask >> i) & 1);
		}
		bool ok = 1;
		for (int i = 0; i < n - k + 1; ++i) {
			int sum = 0;
			for (int j = 0; j < k; ++j) {
				sum += a[i + j];
			}
			if (sum != s[i]) {
				ok = 0;
				break;
			}
		}
		if (ok) {
			++ans;
		}
	}
	cout << ans << "\n";
	return 0;
}