#include <bits/stdc++.h>
#define int long long
using namespace std;
int n, q;
vector<int> x;
signed main() {
cin >> n >> q;
x.resize(q);
for (int i=0; i<q; i++)cin >> x[i];
if (n==2) {
int val = -1;
int count =0;
for (int i=0; i<q; i++) {
if (x[i]==1) {
if (val == -1)val = 0;
else count++;
}
if (x[i]==-1)val = -1;
}
cout << count << endl;
}
}
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