#define _CRT_SECURE_NO_WARNINGS
#include <math.h>
#include<iostream>
#include<cstdio>
#include<algorithm>
#include<string>
using namespace std;
int main() {
    int  m, i, n, s = 0, temp, M = 0;
    int a[10000];
    cin >> n;
    for (i = 0; i < n; i++) {
        cin >> s;
        a[i] = s;
    }
    for (int j = 0; j < n-1; j++)
    {
        for (m = n - 1; m > j; m--)
        {
            if (a[j] > a[j - 1])
            {
                temp = a[j];
                a[j] = a[j - 1];
                a[j - 1] = temp;
                M++;
            }
        }
    }
    cout << M << endl;
    return 0;
}