#include "maklib.h"
#include "message.h"
#include <stdio.h>
#include <stdlib.h>
#include <iostream>

using namespace std;

int main()
{
    if (!MyNodeId())
    {
        const int n = Size();
        long long int sum = 0;
        for (int i = 1; i <= n; i++)
        {
            sum = ((sum > 0) ? sum : 0) + (long long int) ElementAt(i);
        }
sum = ((sum > 0) ? sum : 0);
        cout << sum << endl;
    }

    return 0;
}