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#include <bits/stdc++.h>
#include "krazki.h"
#include "message.h"
#define MP make_pair
#define PB push_back
#define int long long
#define st first
#define nd second
#define rd third
#define FOR(i, a, b) for(int i =(a); i <=(b); ++i)
#define RE(i, n) FOR(i, 1, n)
#define FORD(i, a, b) for(int i = (a); i >= (b); --i)
#define REP(i, n) for(int i = 0;i <(n); ++i)
#define VAR(v, i) __typeof(i) v=(i)
#define FORE(i, c) for(VAR(i, (c).begin()); i != (c).end(); ++i)
#define ALL(x) (x).begin(), (x).end()
#define SZ(x) ((int)(x).size())
using namespace std;
template<typename TH> void _dbg(const char* sdbg, TH h) { cerr<<sdbg<<"="<<h<<"\n"; }
template<typename TH, typename... TA> void _dbg(const char* sdbg, TH h, TA... t) {
  while(*sdbg != ',')cerr<<*sdbg++; cerr<<"="<<h<<","; _dbg(sdbg+1, t...);
}
#ifdef LOCAL
#define debug(...) _dbg(#__VA_ARGS__, __VA_ARGS__)
#define debugv(x) {{cerr <<#x <<" = "; FORE(itt, (x)) cerr <<*itt <<", "; cerr <<"\n"; }}
#else
#define debug(...) (__VA_ARGS__)
#define debugv(x)
#define cerr if(0)cout
#endif
#define next ____next
#define prev ____prev
#define left ____left
#define hash ____hash
typedef long long ll;
typedef long double LD;
typedef pair<int, int> PII;
typedef pair<ll, ll> PLL;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<ll> VLL;
typedef vector<pair<int, int> > VPII;
typedef vector<pair<ll, ll> > VPLL;

template<class C> void mini(C&a4, C b4){a4=min(a4, b4); }
template<class C> void maxi(C&a4, C b4){a4=max(a4, b4); }
template<class T1, class T2>
ostream& operator<< (ostream &out, pair<T1, T2> pair) { return out << "(" << pair.first << ", " << pair.second << ")";}
template<class A, class B, class C> struct Triple { A first; B second; C third;
  bool operator<(const Triple& t) const { if (st != t.st) return st < t.st; if (nd != t.nd) return nd < t.nd; return rd < t.rd; } };
template<class T> void ResizeVec(T&, vector<int>) {}
template<class T> void ResizeVec(vector<T>& vec, vector<int> sz) {
  vec.resize(sz[0]); sz.erase(sz.begin()); if (sz.empty()) { return; }
  for (T& v : vec) { ResizeVec(v, sz); }
}
typedef Triple<int, int, int> TIII;
template<class A, class B, class C>
ostream& operator<< (ostream &out, Triple<A, B, C> t) { return out << "(" << t.st << ", " << t.nd << ", " << t.rd << ")"; }
template<class T> ostream& operator<<(ostream& out, vector<T> vec) { out<<"("; for (auto& v: vec) out<<v<<", "; return out<<")"; }


int Beg1(int id, int wid, int insts) {
  return 1ll * wid * id / insts + 1;
}

int En1(int id, int wid, int insts) {
  return 1ll * wid * (id + 1) / insts;
}

void Minuj(VI& v) {
  for (int i = 1; i < SZ(v); i++) {
    mini(v[i], v[i - 1]);
  }
}

int32_t main() {
  int inst_num_bef;
  int hei = PipeHeight();
  int disks = NumberOfDiscs();
  int id = MyNodeId();
  if (disks > hei) {
    if (id == 0) {
      cout<<"0"<<endl;
    }
    return 0;
  }
  inst_num_bef = min((int)NumberOfNodes(), hei);
  if (id >= inst_num_bef) {
    return 0;
  }
  int lhei = Beg1(id, hei, inst_num_bef), rhei = En1(id, hei, inst_num_bef);
  VI hole_wid;
  FOR (i, lhei, rhei) {
    hole_wid.PB(HoleDiameter(i));
  }
  Minuj(hole_wid);
  REP (i, inst_num_bef) {
    PutLL(i, hole_wid.back());
    Send(i);
  }
  VI blocks_wid;
  REP (i, inst_num_bef) {
    Receive(i);
    blocks_wid.PB(GetLL(i));
  }
  Minuj(blocks_wid);
  int inst_num_aft = min(disks, inst_num_bef);
  if (MyNodeId() >= inst_num_aft) { return 0; }
  int ldisk = Beg1(id, disks, inst_num_aft), rdisk = En1(id, disks, inst_num_aft);
  int gr_wid = 0;
  FOR (i, ldisk, rdisk) {
    maxi(gr_wid, DiscDiameter(i));
  }
  assert(gr_wid);
  int gr_fit = -1;
  REP (i, SZ(blocks_wid)) {
    if (blocks_wid[i] >= gr_wid) {
      gr_fit = i;
    }
  }
  debug(blocks_wid, gr_fit);
  int lowest_imp = min(En1(gr_fit + 1, hei, inst_num_bef) + rdisk - ldisk + 5, hei);
  int highest_imp = max(0ll, En1(gr_fit, hei, inst_num_bef) - (rdisk - ldisk + 5));
  int fir_stop = highest_imp;
  VI mins;
  while (fir_stop + 1 <= lowest_imp && HoleDiameter(fir_stop + 1) >= DiscDiameter(ldisk)) {
    if (fir_stop == 0) {
      mins.PB((int)1e18);
    } else {
      mins.PB(HoleDiameter(fir_stop));
    }
    fir_stop++;
  }
  Minuj(mins);
  debug(id, lowest_imp, highest_imp, ldisk, rdisk, fir_stop);
  debug(mins);
  int cur_hei = fir_stop - 1;
  FOR (i, ldisk + 1, rdisk) {
#warning nie holediameter tylko min prefiksowy
    if (cur_hei - highest_imp >= SZ(mins)) {
      debug("dupa");
    }
    assert(cur_hei - highest_imp < SZ(mins));
    while (cur_hei > 0 && mins[cur_hei - highest_imp] < DiscDiameter(i)) {
      cur_hei--;
      if (cur_hei < highest_imp) {
        debug("dupa2");
      }
      assert(cur_hei >= highest_imp);
    }
    if (cur_hei == 0) {
      cur_hei = -1;
      break;
    }
    cur_hei--;
  }
  cur_hei++;
  int prev_bd = hei + 1;
  if (id) {
    Receive(id - 1);
    prev_bd = GetLL(id - 1);
  }
  int cur_bd = min(prev_bd - (rdisk - ldisk + 1), cur_hei);
  debug(prev_bd, cur_hei, id, cur_bd);
  debug(id, inst_num_aft - 1);
  if (id == inst_num_aft - 1) {
    cout<<max(0ll, cur_bd)<<endl;
    return 0;
  } else {
    PutLL(id + 1, cur_bd);
    Send(id + 1);
  }
  
  return EXIT_SUCCESS;
}