#include <iostream>

using namespace std;

int main(){
	int n,i,j,a[20000],s=0;
	cin>>n;
	for(i=0;i<n;i++){
		cin>>a[i];
	}
	for(i=0;i<n;i++){
		for(j=i+1;j<n;j++){
			if(a[j]<a[i]){
				s++;
			}
		}
	}
	cout<<s<<endl;
}
/**************************************************************
	Problem: 1215
	User: admin
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/