#include<iostream>
#include<vector>

using namespace std;

int main(){
    int N;
    cin >> N;
    vector<int> M(N);

    for (int i=0;i<N;i++){
        cin >> M.at(i);
    }
    
    int X=0;
    for (int i=0;i<N;i++){
        for (int j=i+1;j<N;j++){
            if (M.at(i)>M.at(j)) X++;
        }
    }
    
    cout << X << endl;
}