#include <iostream>
#include <vector>
using namespace std;
int main() {
	cin.tie(0); ios::sync_with_stdio(false);
	int N,at_N,count = 1,temp; cin >> N;
	vector<int> A(N);
	for (int i = 0; i < N; i++) {
		cin >> A[i];
		if (A[i] == N) { at_N = i; temp = N - 1; }
	}
	for (int i = at_N - 1; i >= 0; i--) {
		if (A[i] == temp) { temp--; count++; }
	}
	cout << N - count << endl;
	return 0;
}