#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("ssm.in");
ofstream fout("ssm.out");
int x,s,smin,smax=-1000000000;
int main()
{
    s=0;
    smin=0;
    while(fin>>x)
    {
        s=s+x;
        if(s-smin>smax)
        {
            smax=s-smin;
        }
        if(s<smin)
        {
            smin=s;
        }
    }
    fout<<smax;
    return 0;
}