#include <iostream>
#include <fstream>
using namespace std;

const int N=6000000;
int temp,n,maxc,sc;

int main()
{
    ifstream in ("ssm.in");
    ofstream out("ssm.out");
    in>>n;
    in>>temp;
    temp=sc[1]=maxc;
    for(int i=2;i<=n;i++)
    {
        in>>temp;
        if(sc[i-1]<=0) sc[i]=temp;
        else    sc[i]=sc[i-1]+temp;
        if(sc[i]>maxc)
            maxc=sc[i];
    }
    out<<maxc;
    return 0;
}