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#include <bits/stdc++.h>
#include <message.h>
#include "teatr.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<<")"; }

const int kMaxIntInMsg = 5000000;

void SuperSend(int inst, vector<int>& vec) {
  int msg_num = (SZ(vec) + kMaxIntInMsg - 1) / kMaxIntInMsg;
  PutLL(inst, msg_num); Send(inst);
  REP (msg, msg_num) {
    PutLL(inst, min(kMaxIntInMsg, SZ(vec) - msg * kMaxIntInMsg));
    for (int j = msg * kMaxIntInMsg; j < (msg + 1) * kMaxIntInMsg && j < SZ(vec); j++) {
      PutLL(inst, vec[j]);
    }
    Send(inst);
  }
}
vector<int> SuperReceive(int inst) {
  inst = Receive(inst); int parts = GetLL(inst); vector<int> vec;
  REP (i, parts) {
    Receive(inst); int sz = GetLL(inst);
    REP (j, sz) { vec.PB(GetLL(inst)); }
  }
  return vec;
}
void PutVLL(int to, vector<ll> v) { PutLL(to, SZ(v)); for (auto x : v) PutLL(to, x); }
vector<ll> GetVLL(int from) { vector<ll> v; int k = GetLL(from); REP (i, k) { v.PB(GetLL(from)); } return v; }
void PutPLL(int to, pair<ll, ll> p) { PutLL(to, p.st); PutLL(to, p.nd); }
pair<ll, ll> GetPLL(int from) { int fir = GetLL(from); int sec = GetLL(from); return {fir, sec}; }
int inst_num;
// int Beg1(int n) { return 1ll * n *  MyNodeId()      / inst_num + 1; }
// int En1(int n)  { return 1ll * n * (MyNodeId() + 1) / inst_num;     }
int Beg0(int n, int parts, int wh) { return 1ll * n * wh       / parts;     }
int En0(int n, int parts, int wh)  { return 1ll * n * (wh + 1) / parts - 1; }
int n;

const int K = 1e6 + 5;
int CountDisjoint(int L1, int R1, int L2, int R2) {
  if (L1 > R1 || L2 > R2) { return 0; }
  vector<int> freqs(K);
  assert(R1 < L2);
  FOR (i, L1, R1) {
    freqs[GetElement(i)]++;
  }
  FORD (i, K - 2, 0) {
    freqs[i] += freqs[i + 1];
  }
  int res = 0;
  FOR (i, L2, R2) {
    res += freqs[GetElement(i) + 1];
  }
  return res;
}

int Magic(int n) {
  return n - (n & (n - 1));
}

int CountWithin(int L, int R) {
  if (L > R) { return 0; }
  vector<int> drz(K);
  function<int(int)> Up = [&](int v) {
    int res = 0;
    while (v < K) {
      res += drz[v];
      v += Magic(v);
    }
    return res;
  };
  function<void(int)> Left = [&](int v) {
    while (v) {
      drz[v]++;
      v -= Magic(v);
    }
  };
  int res = 0;
  FOR (i, L, R) {
    int val = GetElement(i);
    res += Up(val + 1);
    Left(val);
  }
  return res;
}
int id;
int my_res;
int max_parts;
void PartitionSmall(int L, int R) {
  vector<int> begs;
  vector<int> ends;
  int parts = max_parts;
  int n = R - L + 1;
  REP (i, parts) {
    begs.PB(L + i * n / parts);
    ends.PB(L + (i + 1) * n / parts - 1);
  }
  vector<pair<PII, PII>> szufla;
  REP (i, parts) {
    REP (j, i + 1) {
      szufla.PB({{begs[j], ends[j]}, {begs[i], ends[i]}});
    }
  }
  debug(SZ(szufla), inst_num);
  assert(SZ(szufla) <= inst_num);
  random_shuffle(ALL(szufla));
  if (SZ(szufla) <= id) { return; }
  if (szufla[id].st.st < szufla[id].nd.st) {
    my_res += CountDisjoint(szufla[id].st.st, szufla[id].st.nd, szufla[id].nd.st, szufla[id].nd.nd);
  } else {
    my_res += CountWithin(szufla[id].st.st, szufla[id].st.nd);
  }
}

void PartitionBig(int n) {
  vector<int> begs;
  vector<int> ends;
  int parts = max_parts;
  REP (i, parts) {
    begs.PB(i * n / parts);
    ends.PB((i + 1) * n / parts - 1);
  }
  REP (i, parts) {
    PartitionSmall(begs[i], ends[i]);
  }
  vector<pair<PII, PII>> szufla;
  REP (i, parts) {
    REP (j, i) {
      szufla.PB({{begs[j], ends[j]}, {begs[i], ends[i]}});
    }
  }
  assert(SZ(szufla) <= inst_num);
  if (SZ(szufla) <= id) { return; }
  my_res += CountDisjoint(szufla[id].st.st, szufla[id].st.nd, szufla[id].nd.st, szufla[id].nd.nd);
}

int32_t main() {

  ios_base::sync_with_stdio(0);
  cout << fixed << setprecision(10);
  cerr << fixed << setprecision(10);
  cin.tie(0);
  //double beg_clock = 1.0 * clock() / CLOCKS_PER_SEC;
  
  n = GetN();
  inst_num = (int)NumberOfNodes();
  id = MyNodeId();
  if (id >= inst_num) { return 0; }
  
  while ((max_parts + 2) * (max_parts + 1) <= 2 * inst_num) {
    max_parts++;
  }
  debug(max_parts);
  
  PartitionBig(n);
  
  PutLL(0, my_res);
  Send(0);
  if (id == 0) {
    int res = 0;
    REP (i, inst_num) {
      Receive(i);
      res += GetLL(i);
    }
    cout<<res<<endl;
  }
  
  return 0;
}