#include<iostream>
#include<climits>
using namespace std;

int main(){
	int n,a[5001];
	int ans;
	a[0]=0;
	while(cin>>n&&n){
		ans = INT_MIN;
		for(int i=1;i<=n;i++){
			cin>>a[i];
			a[i] += a[i-1];
		}
		for(int i=1;i<=n;i++){
			for(int j=i;j<=n;j++){
				ans = max(ans,a[j]-a[i-1]);
			}
		}
		cout<<ans<<endl;
	}
	return 0;
}