#include <iostream>
using namespace std;

int main(){
	int i, j, k, n, sum, result, head, head_before;
	int a[5000];
	while(cin >> n){
		if(n == 0){
			break;
		}
		result = 0;
		head = 0;
		head_before = 0;
		for (i = 0; i < n; i++) {
			cin >> a[i];
		}
		for (i = 0; i < n; i++) {
			if(head > head_before){
				continue;
			}
			for (j = 1; j <= n-i; j++) {
				sum = 0;
				for (k = 0; k < j; k++) {
					sum += a[i+k];
				}
				if(result < sum){
					result = sum;
				}
			}
			head_before = head;
			head += a[i];
		}
		cout << result << endl;
	}
	return 0;
}