#include<bits/stdc++.h>
#define ll long long
using namespace std;

ll ara[10000];
int main()
{
    ll n;
    while(scanf("%lld", &n))
    {
        if(n==0) break;
        for(ll i=1; i<=n; i++){
            scanf("%lld", &ara[i]);
        }

        ll p=0;
        ll s=0;
        for(ll i=1; i<=n; i++){
            s = max(ara[i], s+ara[i]);
            p = max(p, s);
        }
        printf("%lld\n", p);
    }

    return 0;
}