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//~ while (clock()<=69*CLOCKS_PER_SEC)
//~ #pragma comment(linker, "/stack:200000000")
//~ #pragma GCC optimize("O3")
//~ #pragma GCC optimize("Ofast")
//~ #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
//~ #pragma GCC optimize("unroll-loops")
#include "message.h"
#include "kanapka.h"
#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

#define pb push_back
#define SZ(x) ((int)(x).size())
#define ALL(x) x.begin(),x.end()
#define all(x) x.begin(),x.end()
#define fi first
#define se second
#define _upgrade ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

using namespace std;
using namespace __gnu_pbds;
template<typename T>
using ordered_set = tree<
T,
null_type,
less<T>,
rb_tree_tag,
tree_order_statistics_node_update>;

//X.find_by_order(k); - zwraca iterator na k-ty element (numeracja od zerowego)
//X.order_of_key(k); - zwraca liczbę elementów ostro mniejszych niż k

typedef long long LL;
typedef pair<int,int> PII;
typedef pair<LL,LL> PLL;
typedef vector<PII> VPII;
typedef vector<PLL> VPLL;
typedef vector<LL> VLL;
typedef vector<int> VI;
typedef vector<string> VS;
typedef vector<char> VC;
typedef long double LD;
typedef pair<LD,LD> PLD;
typedef vector<LD> VLD;
typedef vector<PLD> VPLD;

template<class TH> void _dbg(const char *sdbg, TH h){ cerr<<sdbg<<" = "<<h<<endl; }
template<class TH, class... TA> void _dbg(const char *sdbg, TH h, TA... a) {
  while(*sdbg!=',')cerr<<*sdbg++;
  cerr<<" = "<<h<<", "; _dbg(sdbg+1, a...);
}

#ifdef LOCAL
#define dbg(...) _dbg(#__VA_ARGS__, __VA_ARGS__)
#else
#define dbg(...)
#define cerr if(0)cout
#endif

const int maxn = (1e6)+7;
const int maxk = 20;
const int inf = (1e9)+7;
const LL LLinf = ((LL)1e18)+7LL;
const LD eps = 1e-9;
const LL mod = 1e9+7;

// ***************************** CODE ***************************** //

LL tab[maxn];
LL prefiks[maxn], sufiks[maxn];
LL elo[3 * maxn];

int main()
{
	_upgrade
  int numer = MyNodeId();
  int ile = NumberOfNodes();
  int n = GetN();
  LL mini = 0LL;
  LL cur = 0LL;
  LL res = 0LL;
  LL pref = 0LL;
  LL suf = 0LL;
  int pocz = n / (numer + 1);
  int kon = pocz + n / ile;
  kon = min(kon, n);
  for(int i = pocz;i < kon;i++)
  {
    elo[i - pocz] = GetTaste(i);
    cur += elo[i - pocz];
    mini = max(mini, cur);
    res = min(res, cur - mini);
    pref = min(pref, cur);
  }
  LL cnt = 0LL;
  for(int i = kon - 1;i >= pocz;i--)
  {
    cnt += elo[i - pocz];
    suf = min(suf, cnt);
  }
  if(numer != 0)
  {
    PutLL(0, cur);
    PutLL(0, res);
    PutLL(0, pref);
    PutLL(0, suf);
    Send(0);
  }
  else
  {
    LL suma = 0LL;
    for(int i = 1;i < ile;i++)
    {
      Receive(i);
      tab[i] = GetLL(i);
      res = min(res, GetLL(i));
      prefiks[i] = GetLL(i);
      sufiks[i] = GetLL(i);
    }
    tab[0] = cur;
    for(int i = 1;i < ile;i++)
      suma += tab[i];
    sufiks[0] = suf;
    prefiks[0] = pref;
    for(int i = 0;i < ile;i++)
      for(int j = i + 1;j < ile;j++)
      {
        LL cn = 0LL;
        for(int k = i + 1;k < j;k++)
          cn += tab[k];
        res = min(res, cn + prefiks[j] + sufiks[i]);
      }
    cout<<suma - res;
  }

	return 0;
}