#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    int s, smax, i, a[100], n;
    cin >> n;
    for (i=1; i<=n; i++)
        cin >> a[i];

    s=smax=a[1];

    for (i=2; i<=n; i++)
    {
        s = s+a[i];
        if (s>smax)  smax = s;
        if (s<0)     s = 0;
    }
    cout << smax << endl;

    return 0;
}