#include<bits/stdc++.h>
using namespace std ;
int n, a[1000009], res = 0, p = 1000009;
pair<long long, int> f[1000009];
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    if(fopen("lsm.inp","r"))
    {
        freopen("lsm.inp","r",stdin);
        freopen("lsm.out","w",stdout);
    }
    cin >> n;
    f[0].first = 0;
    f[0].second = 0;
    for(int i=1; i<=n; i++)
    {
        cin >> a[i];
        f[i].first = f[i - 1].first + a[i];
        f[i].second = i;
    }
 
    sort(f, f + n + 1);
 
    for(int i=0; i<=n; i++)
    {
        res = max(res, f[i].second - p);
        p = min(p, f[i].second);
    }
    cout << res;
    return 0 ;
}
 

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