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

ifstream fin("ssm.in");
ofstream fout("ssm.out");

//int a[60000001];
//int dp[60000001];

int best,d,curent,x,N ;

int maxi(int a,int b)
{
    return a>b ? a:b;
}

int main()
{
    fin>>N>>x;
    best = x;
    curent = x;
    d = x;
    for (int i=2;i<=N;i++)
    {
        fin>>x;
        d = maxi(x,d+x);
        if (d>best) best = d;
    }
    fout<<best;
    return 0;
}