#include <bits/stdc++.h>
using namespace std;
#define int long long
const int maxn = 1e5 + 7, sum = 1e5 + 7;
const int mod = 1e9 + 7;
int dp[maxn];
signed main() {
ios::sync_with_stdio(false);
cin.tie(0);
int n,q;
cin >> n ;
cin >> q;
int cnt = 0;
vector<int>a(q + 1);
for(int i = 1; i <= q; i ++){
cin >> a[i];
if(i != 1){
if(a[i - 1] == 1 && a[i] == 1){
cnt ++;
}
}
}
if(a[1] == 1 && q == 1){
cout << 1 << "\n";
}
else{
cout << cnt << "\n";
}
}
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