#include<bits/stdc++.h>
using namespace std;
int a[200010]={0};
int b[200010]={0};
int main()
{
    freopen("charger.in","r",stdin);
    freopen("charger.out","w",stdout);
    long long ans,n,i,j;
    cin>>n;ans=0;
    for(i=1;i<=n;i++)
    {
        cin>>a[i];
    }
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=n;j++)
        {
            b[j]=0;
        }
        for(j=i+1;j<=n;j++)
        {
            if(a[j]==a[i])
            {
                break;
            }
            if(b[a[j]]==0)
            {
                b[a[j]]++;
                ans++;
            }
        }
    }
    cout<<ans;
    return 0;
}