#include <bits/stdc++.h>
using namespace std;
#define int long long
#define ld double
#define FOR(L , R) for(int i = L;i <= R;i++)
const int INF = 1e18;
const int sz = 2e5 + 5;
const int usz = 1e6 + 5;
const int mod = 998244353;
signed main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
int n ,q ;
cin >> n >> q;
int maks = -1;
int cnt = 0;
for(int i = 0;i < q;i++)
{
int x; cin >> x;
if(x == 1){
cnt++;
maks = max(maks , cnt);
}
else cnt = 0;
}
cout << max(0LL , maks - 1) << endl;
}
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