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


using namespace std;
long long index;

long long calcFront(long long n){
    long long global = 0;
    long long local = 0;
    index = 0;

    for(int i=0;i<n;++i){
        local+=GetTaste(i);
        if(local>global){
            global = local;
            index = i+1;
        }    
    }

}

long long calcBack(long long n){
    long long global = 0;
    long long local = 0;

    for(int i=n-1;i>=0;--i){
        local+=GetTaste(i);
        if(local>global){
            global = local;
            
        }    
    }

}


int main(){
    int nodes,myNode;
    long long n = GetN();
    long long front,back;
    nodes = NumberOfNodes();
    myNode = MyNodeId();
    if(nodes == 1){
        front = calcFront(n);
        if(index == n){
            cout<<front<<endl;
            return 0;
        }
        back = calcBack(n);
        
        cout<<(back+front)<<endl;
        return 0;
    }
    else if(nodes >= 2){
        if(myNode == 0){
            front = calcFront(n);
            if(index == n){
                cout<<front<<endl;
                return 0;
            }

            Receive(1);
            back = GetLL(1);

            cout<<(back+front)<<endl;

            return 0;
        }
        else if(myNode == 1){
            back = calcBack(n);
            PutLL(0,back);
            Send(0);

            return 0;
        }

    }



return 0;
}