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

int p[3009];

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n; cin >> n;
	for (int i = 1; i <= n; i++) {
		int a; cin >> a;
		p[a] = i;
	}
	int ans = 0;
	for (int i = 1; i <= n; i++)
		for (int j = i + 1; j <= n; j++)
			if (p[i] > p[j])
				ans++;
	cout << ans << '\n';
	return 0;
}