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

int main() {
    int n;
    cin >> n;

    vector<int> p(n), q(n);
    for (int i = 0; i < n; i++) {
        cin >> p[i];
        p[i]--;

        q[p[i]] = i;
    }

    int r = 0;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < i; j++) {
            r += q[j] > q[i];
        }
    }
    cout << r << endl;

    return 0;
}