#include <bits/stdc++.h>
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: wangyiyang
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/