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#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;
#include "message.h"

#include "kanapka.h"

typedef long long ll;

ll N;
ll NoN;
ll me;
ll start;
ll finish;
ll size;
ll size2;
ll last;
ll *aA;
ll *aL;
ll *aR;
ll *aM;

ll getA(ll i) {
	if (i<size2)
		return aA[i];
	i-=size2;
	if (i<size)
		return GetTaste(start+i);
	return 0ll;
}

void setA(ll i, ll v) {
	aA[i]=v;
}

ll getL(ll i) {
	if (i<size2)
		return aL[i];
	i-=size2;
	if (i<size)
		return min(0ll,GetTaste(start+i));
	return 0ll;
}

void setL(ll i, ll v) {
	aL[i]=v;
}

ll getR(ll i) {
	if (i<size2)
		return aR[i];
	i-=size2;
	if (i<size)
		return min(0ll,GetTaste(start+i));
	return 0ll;
}

void setR(ll i, ll v) {
	aR[i]=v;
}

ll getM(ll i) {
	if (i<size2)
		return aM[i];
	i-=size2;
	if (i<size)
		return min(0ll,GetTaste(start+i));
	return 0ll;
}

void setM(ll i, ll v) {
	aM[i]=v;
}

int main() {
	bool parallel = true;
	NoN = NumberOfNodes();
	me = MyNodeId();
	N = GetN();

	if (NoN*10>N) parallel = false;

	if (!parallel) if (me>0) return 0;

	if (parallel) {
		start = N*me/NoN;
		finish = N*(me+1)/NoN;
	} else {
		start = 0;
		finish = N;
	}
	size = finish-start;

	size2 = 1;
	while (size2<size) size2 *= 2;

	last = size2*2-2;
	aA = new ll[size2];
	aL = new ll[size2];
	aR = new ll[size2];
	aM = new ll[size2];

	for (ll i=size2-1; i>0; i--) {
		setA(i, getA(i*2)+getA(i*2+1));
	}
	for (ll i=size2-1; i>0; i--) {
		setL(i, min(getL(i*2+1), getA(i*2+1)+getL(i*2)));
	}
	for (ll i=size2-1; i>0; i--) {
		setR(i, min(getR(i*2), getA(i*2)+getR(i*2+1)));
	}
	for (ll i=size2-1; i>0; i--) {
		setM(i, min(min(getM(i*2),getM(i*2+1)),getL(i*2)+getR(i*2+1)));
	}

	if (!parallel) {
		cout << getA(1)-getM(1) << endl;
		return 0;
	}

	PutLL(0, getA(1));
	PutLL(0, getL(1));
	PutLL(0, getR(1));
	PutLL(0, getM(1));
	Send(0);

	if (me>0) return 0;

	delete aA;
	delete aL;
	delete aR;
	delete aM;

	size2 = 1;
	while (size2<NoN) size2 *= 2;

	aA = new ll[size2*2];
	aL = new ll[size2*2];
	aR = new ll[size2*2];
	aM = new ll[size2*2];

	for (int i=0; i<NoN; i++) {
		int j = Receive(-1);
		aA[size2+j] = GetLL(j);
		aL[size2+j] = GetLL(j);
		aR[size2+j] = GetLL(j);
		aM[size2+j] = GetLL(j);
	}

	for (int j=NoN; j<size2; j++) {
		aA[size2+j] = 0ll;
		aL[size2+j] = 0ll;
		aR[size2+j] = 0ll;
		aM[size2+j] = 0ll;
	}

	for (ll i=size2-1; i>0; i--) {
		aA[i] = aA[i*2]+aA[i*2+1];
	}
	for (ll i=size2-1; i>0; i--) {
		aL[i] = min(aL[i*2+1], aA[i*2+1]+aL[i*2]);
	}
	for (ll i=size2-1; i>0; i--) {
		aR[i] = min(aR[i*2], aA[i*2]+aR[i*2+1]);
	}
	for (ll i=size2-1; i>0; i--) {
		aM[i] = min(min(aM[i*2],aM[i*2+1]),aL[i*2]+aR[i*2+1]);
	}

	cout << aA[1]-aM[1] << endl;

	return 0;
}