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#include <iostream>
#include "kanapka.h"
#include "message.h"

using namespace std;

long long sum, minsum, globalminsum = 0, totalsum = 0, this_sum;

int main()
{
    ios_base::sync_with_stdio(false);
    for (long long i = NumberOfNodes() - MyNodeId() - 1 ; i < GetN(); i += NumberOfNodes())
    {
        if (GetTaste(i) >= 0) continue; // nic nie da
        sum = 0;
        minsum = 0;
        for (long long j = i; j < GetN(); ++j)
        {
            sum += GetTaste(j);
            if (sum < minsum) minsum = sum;
        }
        if (minsum < globalminsum) globalminsum = minsum;
    }


    if (MyNodeId() == 0)
    {
        for (long long i = 0; i < GetN(); ++i)
        {
            totalsum += GetTaste(i);
        }

        for (int inst = 1; inst < NumberOfNodes(); ++inst)
        {
            Receive(inst);
            this_sum = GetLL(inst);
            if (this_sum < globalminsum) globalminsum = this_sum;
        }

        cout << totalsum - globalminsum << "\n";
    }
    else
    {
        PutLL(0, globalminsum);
        Send(0);
    }

    return 0;
}