#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int INF = 1000000000;
const ll INFL = 2e18;
template <class T>bool chmin(T &a, T b){ if (a > b) { a = b; return true;} else return false;}
template <class T>bool chmax(T &a, T b){ if (a < b) { a = b; return true;} else return false;}

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

    vector<int> P(N);
    for (int i = 0;i < N;i++)cin >> P[i];

    vector<int> P_id(N);
    for (int i = 0;i < N;i++) { 
        P_id[P[i]-1] = i;
    }

    int ans = 0;
    for (int i = 1;i < N;i++) {
        for (int j = 0;j < i;j++) {
            if (P_id[i] < P_id[j])ans++;
        }
    }

    cout << ans << endl;
}