#include <bits/stdc++.h>

using namespace std;

//macro-----------------------------------------------------------------------------------------
#define rep(i,a,b) for(int i=a;i<b;i++)
#define revrep(i,a,b) for(int i=a;i>b;i--)
//#define int long long


//main------------------------------------------------------------------------------------------
int arr[30005];

int main(){
  
    int n;
    scanf("%d",&n);

    rep(i,0,n){
        scanf("%d", &arr[i]);
    }

    int ans = 0;
    rep(i,0,n){
        rep(j, i + 1, n){
            if(arr[i] > arr[j]) ans++;
        }
    }

    printf("%d\n", ans);



}