#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  vector<int> a(n, 0);
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  for (int i = a.size() - 1; i > 0; i--) {
    if (a[i - 1] > a[i]) {
      cout << i << endl;
      return 0;
    }
  }
  cout << 0 << endl;
  return 0;
}
