#include<bits/stdc++.h>
using namespace std;
using ll =long long;
using vll =vector<ll>;
#define all(A) A.begin(),A.end()
#define rep(i, n) for (long long i = 0; i < (long long)(n); i++)



int main(){
    ll N;
    cin>>N;
    vll A(N);
    rep(i,N)cin>>A[i];
    ll an=0;
    for(ll i=0;i<N-2;i++){
        for (ll j=i+1;j==i+1;j++){
            if(A[i]==A[j])continue;
            for (ll k=j+1;k==j+1;k++){
                if(A[i]==A[k]||A[j]==A[k])continue;
                if(A[i]+A[j]+A[k]-max({A[i],A[j],A[k]})-min({A[i],A[j],A[k]})==A[j])continue;
                an++;
            }
            
        }

    }
    cout<<an<<endl;

}