#include <bits/stdc++.h>
#define f0r(i,n) for(int i=0;i<n;i++)
typedef long long int ll;
using namespace std;
// s1
int main() {
int n, q; cin >> n >> q;
vector<int> a(q+5);
f0r(i,q) cin >> a[i];
int ans = 0;
for (int i = 1; i < q; i++) {
if (a[i] > 0 && a[i-1] > 0) ans++;
}
cout << ans;
return 0;
}
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