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#include <bits/stdc++.h>
using namespace std;
int jsq = 0, a[10001], n;//t储存要交换的车厢
int main() {
cin >> n;
for (int i = 0; i < n; i++) {
cin >> a[i];
}
for (int i = 0; i < n - 1; i++) {
for (int j = 0; j < n - 1; j++) {
if (a[j] > a[j + 1]) {
swap(a[j + 1], a[j]);
jsq++;//记录交换次数
}
}
}
cout << jsq;
return 0;
}