using System;

public class Hello
{
    public static void Main()
    {
        var n = int.Parse(Console.ReadLine().Trim());
        var a = new int[n];
        for (int i = 0; i < n; i++) a[i] = int.Parse(Console.ReadLine().Trim());
        Console.WriteLine(getAns(a));
    }
    public static int getAns(int[] a)
    {
        var n = a.Length;
        var ans = 0;
        for (int i = 0; i < n; i++)
            for (int j = i + 1; j < n; j++)
                if (a[j] < a[i]) ans++;
        return ans;
    }
}