#include <bits/stdc++.h>

using namespace std;

int main() {
    freopen("ssm.in", "r", stdin);
    freopen("ssm.out", "w", stdout);
    long long maxSum = -9999999999;
    long long currentSum = 0;
    int n;
    cin >> n;
    for (int i = 1; i <= n; ++i) {
        int x;
        cin >> x;
        currentSum += x;
        maxSum = max (currentSum, maxSum);
        if (currentSum < 0) {
            currentSum = 0;
        }
    }
    cout << maxSum;
    return 0;
}