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

struct sd {
    ll value;
    ll index;
};

bool compare(sd a, sd b) {
    return a.value < b.value;
}

int main() {
    int n, sum = 0;
    cin >> n;

    sd a[100000];
    for (int i = 0; i < n; i++) {
        cin >> a[i].value;
        a[i].index = i;
    }

    sort(a, a + n, compare);

    for (int i = 0; i < n; i++) {
        for (int j = i + 1; j < n; j++) {
            if (a[j].index < a[i].index) {
                sum++;
            }
        }
    }

    cout << sum << endl;
    return 0;
}