#include<cstdio>
#include<cstring>
#include<iostream>
int n,a[150],i,j,t,f;
using namespace std;
int main() {
	cin>>n;	
	for(i=1;i<=n;i++){
		cin>>a[i];	
	}
	for(j=1;j<=n-1;j++)	{
		for(i=n;i>=j+1;i--)	{
			if(a[i-1]>a[i]){
				f++;
			}	
		}
	}
	cout<<f;
	return 0;
}