#include "bits/stdc++.h"
using namespace std;
#define intt long long
#define fi first
#define se second
#define endl "\n"
const intt mxN = 2e5+67;
const intt LG = 31;
const intt inf = 1e18;
const intt mod = 1e9 + 7;
void smile() {
intt n, d;
cin >> n >> d;
vector<intt> a(n);
for(intt i = 0; i < n; i++) {
cin >> a[i];
}
intt move = d, r = 0, ans = 0;
while(r < n) {
while(move > 0 && r < n) {
// cout << r << "w" << endl;
r++;
move--;
if(a[r] == 1) move = d;
}
if(r > n - 1) break;
if(a[r] == 0) {
move = d;
ans++;
} else {
move = d;
}
}
cout << ans << endl;
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
// freopen("island.in", "r", stdin);
// freopen("island.out", "w", stdout);
intt t = 1, buu = 1;
// cin >> t;
while(t--){
// cout << "Case #" << buu++ << ": ";
smile();
}
}
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