#include <bits/stdc++.h>
using namespace std;
int main(){
	int n,N[10005] = {0},cnt = 0,idx = 0;
	cin >> n;
	for (int i = 0;i < n;i++){
		cin >> N[i];
	}
	do{
		idx = 0;
		for (int i = 0;i < n - 1;i++){
			if (N[i] > N[i + 1]){
				int tmp;
				tmp = N[i];
				N[i] = N[i + 1];
				N[i + 1] = tmp;
				idx++;
				cnt++;
			}
		}
	}while(idx != 0);
	printf("%d",cnt);
	return 0;
}