#include <iostream>
#include <vector>
using namespace std;

int main()
{
    int N;
    cin >> N;
    vector<int> a2i(N);
    for (int i = 0; i < N; i++)
    {
        int a;
        cin >> a;
        a2i[a - 1] = i;
    }
    int high = N, ret = 0;
    for (int i = N - 1; i >= 0; i--)
    {
        if (a2i[i] > high) ret++;
        else high = a2i[i];
    }
    cout << ret << '\n';
}