#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 ans = 0;
int n , q;
cin >> n >> q;
int cur[2];
cur[0] = cur[1] = 0;
map < int , int > cnt;
cnt[1] = 0;
cnt[0] = -1;
while(q--)
{
int x;
cin >> x;
if(x == 1)
{
cnt[0]++;
ans = max(ans , cnt[0]);
cnt[1] = 0;
}
else
{
cnt[1]++;
cnt[0] = -1;
}
}
cout << ans << endl;
}
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