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

using namespace std;
#define PB push_back
#define MP make_pair
#define LL long long
#define int LL
#define short int32_t
#define FOR(i,a,b) for(int i = (a); i <= (b); i++)
#define RE(i,n) FOR(i,1,n)
#define REP(i,n) FOR(i,0,(int)(n)-1)
#define R(i,n) REP(i,n)
#define VI vector<int>
#define PII pair<int,int>
#define LD long double
#define FI first
#define SE second
#define st FI
#define nd SE
#define ALL(x) (x).begin(), (x).end()
#define SZ(x) ((int)(x).size())
void put(int a,int b){
  PutInt(a,int32_t(b));
}
#define PutInt dgayuwgyugugdw

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 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...);
}

template<class T> ostream& operator<<(ostream& os, vector<T> V) {
  os << "["; for (auto& vv : V) os << vv << ","; os << "]";
  return os;
}

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

const int MAX = 1e6 + 1;
int proc,id;
int dp[MAX];
int res = 0;
int n;
void sum(int x){
  for(;x < MAX; x += (x & -x)){
    res += dp[x];
  }
}
void add(int x){
  for(;x;x -= (x & -x)){
    dp[x]++;
  }
}
void licz(int po, int ko){
  R(i,po){
    dp[GetElement(i)]++;
  }
  for(int i = MAX -1 ;i;i--){
    dp[i - (i&-i)] += dp[i];
  }
  for(int i = po; i< ko; i++){
    int pom = GetElement(i);
    sum(pom + 1);
    add(pom);
  }
  PutLL(0,res);
  Send(0);
}

void lacz(){
  int wyn = 0;
  R(i,proc){
    Receive(i);
    wyn += GetLL(i);
  }
  cout << wyn << "\n";
}

int32_t main(){
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout << fixed << setprecision(11);
  cerr << fixed << setprecision(6);

  proc = NumberOfNodes();
  id = MyNodeId();
  n = GetN();
  int il = (n + proc - 1) / proc;
  licz(min(il*id, n), min(il*(id+1),n));
  if(id == 0)lacz();
}