#include <fstream>
using namespace std;

ifstream cin("secv2.in");
ofstream cout("secv2.out");

int n, v[ 50000 ];
int main()
{
	cin >> n;
	for ( int i = 0; i < n; ++i )
		cin >> v[ i ];
    int 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;
}