// Nachia くんだよ

#include <iostream>
#include <vector>
#include <deque>
using namespace std;
using ll = long long;
using ull = unsigned long long;
#define rep(i,n) for(int i=0; i<(n); i++)


int main() {
  int N; cin >> N;
  vector<int> P(N);
  rep(i,N){ int p; cin >> p; P[p-1] = i; }
  int ans = 0;
  rep(i,N) rep(j,i) if(P[i] < P[j]) ans++;
  cout << ans << "\n";
  return 0;
}


struct ios_do_not_sync{
  ios_do_not_sync(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
  }
} ios_do_not_sync_instance;