#include <fstream>

using namespace std;

ifstream f("ssm.in");
ofstream g("ssm.out");

long N,beg,end,idx;
long long sum,best,V[600002];

int main()
{
    f>>N;

    idx=1;

    for (long i=1;i<=N;i++)
    { f>>V[i];

      if (sum<0)
        {sum=V[i];idx=i;}
      else
        sum+=V[i];

     if(sum>best)
        {
            best=sum;
            end=i;
            beg=idx;
        }
    }
    g<<best;
    return 0;
}