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

using namespace std;

int main()
{
    long long tmpL=0,tmpR=0;
    long long iL=0,iR=GetN()-1;
    long long right=0,left=0;
    long long sum=0;
    for(long long i=0; i<GetN(); i++)
    {
        tmpL+=GetTaste(i);
        if(tmpL>left)
        {
            left=tmpL;
            iL=i;
            if(iR>iL)
            {
                if(sum<right+left) sum=right+left;
            }
            else break;
        }
        tmpR+=GetTaste(GetN()-1-i);
        if(tmpR>right)
        {
            right=tmpR;
            iR=GetN()-1-i;
            if(iR>iL)
            {
                if(sum<right+left) sum=right+left;
            }
            else break;
        }
    }
    if(right>sum) sum=right;
    if(left>sum) sum=left;
    //Send(sum);
    //Receive(0);
    if(MyNodeId()==0) cout << sum << endl;

    return 0;
}






/*
int main()
{
    //int tab[]={100,-2,-1,-1,-3,-5,100};
    //int tab[]= {10,-2,5,-1,3,-5,1};
    int tab[]= {2};
    GetN();
    GetTaste(0);
    //GetTaste(1);
    cout << GetTaste(1) << endl;
    return 0;
    int tabsize=sizeof(tab)/sizeof(int);
    int tmpL=0,tmpR=0;
    int iL=0,iR=tabsize-1;
    int right=0,left=0;
    int sum=0;
    for(int i=0; i<tabsize; i++)
    {
        tmpL+=tab[i];
        if(tmpL>left)
        {
            left=tmpL;
            iL=i;
            if(iR>iL)
            {
                if(sum<right+left) sum=right+left;
            }
            else break;
        }

        tmpR+=tab[tabsize-1-i];
        if(tmpR>right)
        {
            right=tmpR;
            iR=tabsize-1-i;
            if(iR>iL)
            {
                if(sum<right+left) sum=right+left;
            }
            else break;
        }
    }
    if(right>sum) sum=right;
    if(left>sum) sum=left;

    cout << left << endl;
    cout << right << endl;
    cout << sum<< endl;

    return 0;
}*/