#include <iostream>
#include <fstream>
using namespace std;
#define DIM 1000001
int v[DIM],cnt;
int main()
{
    ifstream cin("inversiuni.in");
    ofstream cout("inversiuni.out");
    int n;
    cin>>n;
    for(int i=1;i<=n;i++)
        cin>>v[i];
    for(int i=1;i<=n;i++)
    {
        for(int j=i;j<=n;j++)
        {
            if(v[i]>v[j])
            cnt++;
        }
    }
    cout<<cnt;
    return 0;
}