#include <bits/stdc++.h>
using namespace std;
const int N = 200010;
const int INF = 0x3f3f3f3f;
int n, a[N], res = -INF;
int sum[N];
int main() {
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];                //输入
        sum[i] = sum[i - 1] + a[i]; //记录前缀和
    }
    for (int i = 1; i <= n; i++)
        for (int j = i; j <= n; j++)
            res = max(res, sum[j] - sum[i - 1]);

    cout << res << endl;
    return 0;
}