/* @_@ Smile :) */
#include <bits/stdc++.h>
#define ll long long
#define f first
#define s second
#define mk make_pair
#define pb push_back
#define pop pop_back
using namespace std;
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
int N, D;
cin >> N >> D;
int A[N];
for(int i = 0;i < N;i++)
cin >> A[i];
int suma = 0, aux = D;
for(int i = 0;i < N;i++){
if(A[i] == 1)
aux = D;
if(A[i] == 0)
aux--;
if(aux == 0){
aux = D;
suma++;
}
}
cout << suma << '\n';
return 0;
}
/*
(N * (N + 1)) / 2
double pi = acos(-1);
*/
// 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37
// j %
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