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#include <string>
#include <vector>
#include <algorithm>
#include <cmath>
#include <set>
#include <queue>
#include <map>
#include <cstdio>
#include <iomanip>
#include <sstream>
#include <iostream>
#include <cstring>
#define REP(i,x,v)for(int i=x;i<=v;i++)
#define REPD(i,x,v)for(int i=x;i>=v;i--)
#define FOR(i,v)for(int i=0;i<v;i++)
#define FORE(i,t) for (typeof(t.begin()) i=t.begin(); i!=t.end(); i++)
#define FOREACH(i,t) FORE(i,t)
#define REMIN(x,y) (x)=min((x),(y))
#define REMAX(x,y) (x)=max((x),(y))
#define pb push_back
#define sz size()
#define mp make_pair
#define fi first
#define se second
#define ll long long
#define IN(x,y) ((y).find((x))!=(y).end())
#define un(v) v.erase(unique(ALL(v)),v.end())
#define LOLDBG
#ifdef LOLDBG
#define DBG(vari) cerr<<#vari<<" = "<<vari<<endl;
#define DBG2(v1,v2) cerr<<(v1)<<" - "<<(v2)<<endl;
#else
#define DBG(vari)
#define DBG2(v1,v2)
#endif
#define CZ(x) scanf("%d",&(x));
#define CZ2(x,y) scanf("%d%d",&(x),&(y));
#define CZ3(x,y,z) scanf("%d%d%d",&(x),&(y),&(z));
#define wez(x) int x; CZ(x);
#define wez2(x,y) int x,y; CZ2(x,y);
#define wez3(x,y,z) int x,y,z; CZ3(x,y,z);
#define SZ(x) int((x).size())
#define ALL(x) (x).begin(),(x).end()
#define tests int dsdsf;cin>>dsdsf;while(dsdsf--)
#define testss int dsdsf;CZ(dsdsf);while(dsdsf--)
using namespace std;
typedef pair<int,int> pii;
typedef vector<int> vi;
template<typename T,typename TT> ostream &operator<<(ostream &s,pair<T,TT> t) {return s<<"("<<t.first<<","<<t.second<<")";}
template<typename T> ostream &operator<<(ostream &s,vector<T> t){s<<"{";FOR(i,t.size())s<<t[i]<<(i==t.size()-1?"":",");return s<<"}"<<endl; }
inline void pisz (int x) { printf("%d\n", x); }
#include "message.h"
#include "maklib.h"


int main()
{
    ios_base::sync_with_stdio(0);
    int n=Size();
    int myid=MyNodeId();
    int ile=NumberOfNodes();
    int pocz=myid*n/ile,kon=(myid+1)*n/ile;
    ll sum=0,mx=0,mn=0,best=0;
    REP(i,pocz,kon-1)
    {
        int x=ElementAt(i+1);
        sum+=x;
        REMAX(best,sum-mn);
        REMAX(mx,sum);
        REMIN(mn,sum);
    }
    PutLL(0,sum);
    PutLL(0,mx);
    PutLL(0,mn);
    PutLL(0,best);
    Send(0);
    ll wyn=0;
    ll s=0;
    ll amn=0;
    if (myid==0)
	{
		FOR(i,ile)
		{
			Receive(i);
			ll rsum=GetLL(i);
			ll rmx=GetLL(i);
			ll rmn=GetLL(i);
			ll rbest=GetLL(i);
			DBG(rbest);
			REMAX(wyn,sum+rmx-amn);
			REMAX(wyn,rbest);
			REMIN(amn,rmn+sum);
			sum+=rsum;
		}
		cout<<wyn<<endl;
	}




    return 0;
}