#include<bits/stdc++.h>
using namespace std;
short n,i,j,X[10093],times;
int main(){
	cin>>n;
	for(i=1;i<=n;++i)cin>>X[i];
	for(i=1;i<n;++i){
		for(j=i;j<=n;++j){
			if(X[i]>X[j]){
				swap(X[i],X[j]);
				++times;
			}
		}
	}cout<<times;
	return 0;
}