https://www.e-olymp.com/az/problems/2663

/*
    Author: Kanan Asgarli
    https://www.e-olymp.com/az/problems/2663
*/
#include <iostream>
using namespace std;
int main()
{
    //bubble sort
    int n, say = 0;
    cin>>n;
    int a[n];
    for(int i = 0; i < n; i++)
        cin>>a[i];
    for(int i = 0; i < n; i++){
        for(int j = 0; j < n-1; j++){
            if(a[j] > a[j+1]){
                swap(a[j], a[j+1]);
                say++;
            }
        }
    }
    cout<<say<<endl;
    return 0;
}