#include <iostream>
#include <vector>
#include <cmath>
#include <map>
#include <set>
#include <iomanip>
#include <queue>
#include <algorithm>
#include <numeric>
#include <deque>
#include <complex>
#include <cassert>

using namespace std;
using ll = long long;

int main(){

    ll ans=0, N, x;
    cin >> N;
    vector<ll> P(N+1), pos(N+1);
    for (int i=1; i<=N; i++){
        cin >> P[i];
        pos[P[i]] = i;
    }
    for (int i=1; i<=N; i++){
        if (P[i] == i) continue;
        x = P[i];
        for (int j=x; j>=i+1; j--){
            P[i] = j-1;
            P[pos[j-1]] = j;
            swap(pos[j], pos[j-1]);
            ans++;
        }
    }
    cout << ans << endl;

    return 0;
}