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

#define _DEBUG
#ifdef _DEBUG
#define DEBUG_START() std::cerr << "(" << MyNodeId() << ")"
#define DEBUG_END() << "\n"
#define DEBUG_ONE(x) "  " #x " ---> " << (x)

#define DEBUG1(x) DEBUG_START() DEBUG_ONE(x) DEBUG_END();
#define DEBUG2(x, y) DEBUG_START() DEBUG_ONE(x) << DEBUG_ONE(y) DEBUG_END();
#else
#define DEBUG1(x)
#define DEBUG2(x, y)
#endif

int main() {
    long long int parts = GetN();
    int numberOfNodes = NumberOfNodes();
    long long int partSize = (parts + numberOfNodes - 1) / numberOfNodes;
    long long int instanceBegin = MyNodeId() * partSize;
    long long int instanceEnd = std::min(instanceBegin + partSize, parts);
    DEBUG2(instanceBegin, instanceEnd);
    long long int instanceMinSum = std::numeric_limits<long long int>::max();
    long long int instanceMinSumTillNow = instanceMinSum;
    long long int instanceSum = 0;
    long long int instanceMinPrefixesSums = instanceSum;
    for (long long int part = instanceBegin; part < instanceEnd; ++part) {
        long long int taste = GetTaste(part);
        instanceSum += taste;
        instanceMinPrefixesSums = std::min(instanceMinPrefixesSums, instanceSum);
        if (instanceMinSumTillNow > 0) {
            instanceMinSumTillNow = taste;
        } else {
            instanceMinSumTillNow += taste;
        }
        instanceMinSum = std::min(instanceMinSum, instanceMinSumTillNow);
    }
    if (MyNodeId() < numberOfNodes - 1) {
        PutLL(numberOfNodes - 1, instanceSum);
        PutLL(numberOfNodes - 1, instanceMinPrefixesSums);
        PutLL(numberOfNodes - 1, instanceMinSumTillNow);
        PutLL(numberOfNodes - 1, instanceMinSum);
        Send(numberOfNodes - 1);
    } else {
        for (int i = numberOfNodes - 2; i >= 0; --i) {
            Receive(i);
            long long int remoteSum = GetLL(i);
            long long int remoteMinPrefixesSums = GetLL(i);
            long long int remoteMinSumTillNow = GetLL(i);
            long long int remoteMinSum = GetLL(i);
            instanceMinSum = std::min(std::min(instanceMinSum, remoteMinSum), instanceMinPrefixesSums + remoteMinSumTillNow);
            instanceSum += remoteSum;
            instanceMinPrefixesSums = std::min(remoteMinPrefixesSums, remoteSum + instanceMinPrefixesSums);
        }
        std::cout << instanceSum - instanceMinSum << "\n";
    }
}