//#include <bits/stdc++.h>
#include<iostream>
using namespace std;
#define int long long

#define rep(i,s,n) for(int i = s;i<n;i++)
/*#define repe(i,s,n) for(int i = s;i<=n;i++)
#define rrep(i,s,n) for(int i = (n)-1;i>=(s);i--)
#define all(v) (v).begin(),(v).end()
#define pb push_back
#define fi first
#define se second
typedef long long ll;
typedef pair<int,int>pint;
typedef vector<int>vint;
typedef vector<pint>vpint;
typedef pair<pint,int> P1;
typedef pair<int,pint> P2;
static const ll maxLL = (ll)1 << 62;
const ll MOD=1000000007,INF=1e18;
int dy[]={-1,0,1,0};
int dx[]={0,1,0,-1};*/

int n,a[100010];
 
signed main(){
	cin>>n;
	rep(i,0,n){
	    cin>>a[i];
	}
	int ans=0;
	rep(i,0,n-1)rep(j,i+1,n){
	    if(a[i]>a[j])ans++;
	}
	cout<<ans<<endl;
	
	return 0;
}