#include <iostream>
#include <fstream>
using namespace std;
ifstream in ("ssm.in");
ofstream out ("ssm.out");
int main()
{
    int n,x,sc=0,smax=-2000000000;
    in >> n;
    for(int i=1; i<=n; i++)
    {
        in>>x;
        if(sc<0)
        {
            sc=x;
        }
        else
        {
           sc+=x;
        }
        if(sc>smax)
        {
            smax=sc;
        }
    }
    out<<smax;
    return 0;
}