#include <iostream>
#include <fstream>
using namespace std;

int main()
{
    int v[1000],n=0,i,s,max=0;
    ifstream f("date.in");
    while(f>>v[n])
        n++;
    for(i=0;i<n;i++)
     {
         if(s>0)
            s=s+v[i];
         else
            s=v[i];
        if(s>max)
            max=s;
     }
     cout<<max;

    return 0;
}