#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  int n;
  cin >> n;

  list<int> xs;
  vector<list<int>::iterator> itrs(n+1);
  REP (i, n) {
    int a;
    cin >> a;
    xs.push_back(a);
    auto itr = xs.end();
    itrs[a] = --itr;
  }

  int ret = 0;
  for (int i = 1; i <= n; i++) {
    if (itrs[i] != xs.begin())
      ++ret;
    xs.erase(itrs[i]);
  }

  cout << ret << endl;
  
  return 0;
}