#include <bits/stdc++.h>
using namespace std;
int main(){
    int n, i;
    cin>>n;
    vector<int>v(n), v2(n); 
    int count = 0;
    for (i=0;i<n;i++){
        cin >> v[i];
        v2[i] = v[i];
    }
    sort(v2.begin(),v2.end());
    while (v != v2){
        for (i=0;i<n;i++){
            if (v[i] > v[i+1]){
                swap(v[i],v[i+1]);
                count++;
                break;
            }
        } 
    }  
    cout << count;
    return 0;
}