//#include <iostream>
#include <fstream>

using namespace std;

ifstream cin("ssm.in");
ofstream cout("ssm.out");

int main()
{
    int n;
    cin >> n;
    int v[6000000];
    for (int i = 0; i < n; i++){
        cin >> v[i];
    }
    long long suma = 0, sumaMax = 0;
    for(int i = 0; i < n; i++)
    {
        suma = suma + v[i];
        if(suma < 0)
            suma = 0;
        if(suma > sumaMax)
            sumaMax = suma;
    }
    cout << sumaMax;
    return 0;
}