#include <iostream>
#include <algorithm>
#include <vector>
#include <map>
#include <cmath>
#include <deque>
#include <set>

using namespace std;

#define speedup ios::sync_with_stdio(0),cin.tie(0);

long long int power(long long int n,long long int p)
{
    long long int x=1;
    for(int i=1;i<=p;i++)
    {
        x*=n;
    }
    return x;
}

template<typename t>
t gcd(t a,t b)
{
    if(b==0)
    {
        return a;
    }
    return gcd(b,a%b);
}

long long int maxSubArraySum(vector<long long int>&a)
{
    int max_so_far = -10000000, max_ending_here = 0;

    for (int i = 1; i < a.size(); i++)
    {
        max_ending_here = max_ending_here + a[i];
        if (max_so_far < max_ending_here)
            max_so_far = max_ending_here;

        if (max_ending_here < 0)
            max_ending_here = 0;
    }
    return max_so_far;
}


int main()
{
    speedup;

    int n;
    long long int mx=(-10000000),h;
    cin>>n;
    vector<long long int>a(n+1);
    for(int i=1;i<=n;i++)
    {
        cin>>a[i];
    }
    cout<<maxSubArraySum(a)<<endl;

    return 0;
}