#include <iostream>
using namespace std;

int main() {
    int n;
    cin >> n;

    int x;
    cin >> x;

    int cur = x;   
    int ans = x;   

    for (int i = 1; i < n; i++) {
        cin >> x;

        if (cur < 0)
            cur = x;    
        else
            cur += x;    

        if (cur > ans)
            ans = cur;
    }

    cout << ans << endl;
    return 0;
}