#include <fstream>

using namespace std;

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

int n, s, smx = -1002 ;

///-4 6 -7 -2 1 -4 10 3 -9 -2 2

int main()
{
    while ( cin >> n )
    {
        if ( s <= 0 )
            s = n ;
        else
            s += n ;
        if ( smx < s )
            smx = s ;
    }
    cout << smx ;
}