#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <cmath>
#include <cstdio>
#include <functional>
#include <numeric>
#include <stack>
#include <queue>
#include <map>
#include <set>
#include <utility>
#include <sstream>
#include <complex>

using namespace std;

#define FOR(i,a,b) for(long long i=(a);i<(b);i++)
#define REP(i,N) for(long long i=0;i<(N);i++)
#define ALL(s) (s).begin(),(s).end()
#define fi first
#define se second

#define PI acos(-1.0)
#define INF 1000000007

typedef long long ll;
typedef pair<ll, ll> P;
typedef pair<double, double> PD;
typedef pair<string, ll> PS;
typedef vector<ll> V;

ll a[111];
int n;

int main(){
	while (cin >> n&&n){
		REP(i, 100)a[i] = 0;
		int co = 0;
		REP(i,n){
			cin >> a[i];
		}
		for (int i = n - 1; i > 0; i--){
			for (int j = 0; j < i; j++){
				if (a[j]>a[i]){
					swap(a[j], a[i]);
					co++;
				}
			}
		}
		//cout << "!";
		cout<< co << endl;

	}
}