#include <bits/stdc++.h>
using namespace std;

int main() {
    int n;
    cin >> n;
    vector<int> a(n);
    for (int i = 0; i < n; ++i) {
        cin >> a[i];
    }
    vector<int> dp;
    for (int x : a) {
        auto it = lower_bound(dp.begin(), dp.end(), x);
        if (it == dp.end()) {
            dp.push_back(x);
        } else {
            *it = x;
        }
    }
    cout << n - dp.size() << endl;
    return 0;
}