#define _CRT_SECURE_NO_WARNINGS

#include<cstring>

#include<cctype>

#include<cstdlib>

#include<iomanip>

#include<cmath>

#include<cstdio>

#include<string>

#include<climits>

#include<stack>

#include<ctime>

#include<list>

#include<set>

#include<map>

#include<queue>

#include<vector>

#include<sstream>

#include<fstream>

#include<iostream>

#include<functional>

#include<algorithm>

#include<memory.h>

//#define INF LONG_MAX

#define eps 1e-6

#define pi acos(-1.0)

#define e exp(1.0)

#define rep(i,t,n)  for(int i =(t);i<=(n);++i)

#define per(i,n,t)  for(int i =(n);i>=(t);--i)

#define mp make_pair

#define pb push_back

#define mmm(a,b) memset(a,b,sizeof(a))

//std::ios::sync_with_stdio(false);

using namespace std;

typedef long long ll;

typedef unsigned long long ull;

void smain();

#define ONLINE_JUDGE

int main() {

    //ios::sync_with_stdio(false);

#ifndef ONLINE_JUDGE

    freopen("C:\\Users\\SuuTT\\Desktop\\test\\in.txt", "r", stdin);

    freopen("C:\\Users\\SuuTT\\Desktop\\test\\out.txt", "w", stdout);

    //ifstream in;

    //string filename;

    //getline(cin, filename,'\n');

    //in.open(filename);

    long _begin_time = clock();

#endif

    smain();

#ifndef ONLINE_JUDGE

    long _end_time = clock();

    printf("time = %ld ms.", _end_time - _begin_time);

#endif

    return ;

}

int dir[][] = { ,,,,-,,,- };

const int maxn = 5e5 + ;

int n, m;

ll a[maxn];

pair<int, int> aa[maxn];

int d[maxn];

int level[maxn];

int lowbit(int x) { return x & (-x); }

void add(int x, int v) {//a[x]+=v;

    while (x <= maxn) {

        d[x] += v;

        x += lowbit(x);

    }

}

int query(int x) {

    int res = ;

    while (x) {

        res += d[x];

        x -= lowbit(x);

    }

    return res;

}

struct node {

    int x, y;

    node(int x = , int y = ) :x(x), y(y) {}

};

void Run() {

}

void smain() {

    while (cin >> n){

        if (!n)return;

        mmm(d, );

        rep(i, , n) {

            scanf("%d", &aa[i].first);

            aa[i].second = i;

        }

            sort(aa+, aa + n+);

            rep(i, , n)a[i] = aa[i].second;//a[aa[i].second]=i;

            ll ans = ;

            rep(i, , n) {

                add(a[i], );

                ans += (i - query(a[i]));

            }

            cout << ans << endl;

    }

}