#include <bits/stdc++.h>
using namespace std;
const int N = 200010;
const int INF = 0x3f3f3f3f;
int res = -INF;
int a[N];
int n;
int main() {
    cin >> n;
    for (int i = 1; i <= n; i++) cin >> a[i];
    for (int i = 1; i <= n; i++)       //枚举起点
        for (int j = i; j <= n; j++) { //枚举终点
            int sum = 0;
            for (int k = i; k <= j; k++) sum += a[k]; //区间内的和
            res = max(res, sum);
        }
    cout << res << endl;
    return 0;
}