#include    <iostream>
#include    <fstream>

using namespace std;

ifstream fin("bac.in");

int main()
{
    int x, s = 0, smax = 0;
    int max = -1000, poz = 0;
    while(fin >> x)
    {
        s = s + x;
        if(s < 0)
            s = 0;
        if(s > smax)
            smax = s;
        if(x > max)
            max = x;
        if(x > 0)
            poz++;
    }
    if(poz == 0)
        cout << max;
    else
        cout << smax;
    return 0;
}