#include <ext/pb_ds/tree_policy.hpp>
#include <functional>
#include<bits/stdc++.h>
using namespace std;
using namespace __gnu_pbds;




#define pf                  printf
#define sf(a)               scanf("%d",&a)
#define sfl(a)              scanf("%lld",&a)
#define sff(a,b)            scanf("%d %d",&a,&b)
#define sffl(a,b)           scanf("%lld %lld",&a,&b)
#define sfff(a,b,c)         scanf("%d %d %d",&a,&b,&c)
#define sfffl(a,b,c)        scanf("%lld %lld %lld",&a,&b,&c)
#define sffff(a,b,c,d)      scanf("%d %d %d %d",&a,&b,&c,&d)
#define sffffl(a,b,c,d)     scanf("%lld %lld %lld %lld",&a,&b,&c,&d)
#define sfffff(a,b,c,d,e)   scanf("%d %d %d %d %d",&a,&b,&c,&d,&e)
#define sfffffl(a,b,c,d,e)  scanf("%lld %lld %lld %lld %lld",&a,&b,&c,&d,&e)
#define sfc(a)              scanf("%c",&a)
#define pii                 pair<int,int>
#define ms(a,b)             memset(a,b,sizeof(a))
#define pb(a)               push_back(a)
#define pbp(a,b)            push_back({a,b})
#define db                  double
#define ft                  float
#define ll                  long long
#define ull                 unsigned long long
#define pii                 pair<int,int>
#define ff                  first
#define ss                  second
#define sz(x)               x.size()
#define all(x)              x.begin(),x.end()
#define CIN                 ios_base::sync_with_stdio(0); cin.tie(0)
#define max3(a, b, c)       max(a, b) > max(b, c) ? max(a, b) : max(b, c)
#define min3(a, b, c)       min(a, b) < min(b, c) ? min(a, b) : min(b, c)
#define for0(i,n)           for(int i=0;i<n;i++)
#define for1(i,n)           for(int i=1;i<=n;i++)
#define forrev(i,n)         for(int i=n-1; i>=0; i--)
#define forab(i,a,b)        for(int i=a;i<=b;i++)
#define forba(i,b,a)        for(int i=b;i>=a;i--)
#define stlloop(x)          for(__typeof(x.begin()) it=x.begin();it!=x.end();it++)
#define gcd(a, b)           __gcd(a, b)
#define lcm(a, b)           ((a)*((b)/gcd(a,b)))
#define case1(z)            cout<<"Case "<<z<<": "
#define case2(z)            printf("Case %d: ",z)
#define PI                  acos(-1) //3.14159265358979323846264338328
#define valid(tx,ty)        tx>=0 && tx<row && ty>=0 && ty<col
#define intlim              2147483648
#define N                   200007
#define inf                 100000008
#define mod                 1000000007

/*------------------------------Graph Moves----------------------------*/
//const int fx[]={+1,-1,+0,+0};
//const int fy[]={+0,+0,+1,-1};
//const int fx[]={+0,+0,+1,-1,-1,+1,-1,+1};   // Kings Move
//const int fy[]={-1,+1,+0,+0,+1,+1,-1,-1};  // Kings Move
//const int fx[]={-2, -2, -1, -1,  1,  1,  2,  2};  // Knights Move
//const int fy[]={-1,  1, -2,  2, -2,  2, -1,  1}; // Knights Move
/*---------------------------------------------------------------------*/

/*
vector<ll>vec;
bool chk[N];
void sieve()
{
    ll i,j;
    for(i=4;i<N;i+=2)
        chk[i]=1;
    for(i=3;i<=sqrt(N);i+=2)
    {
        for(j=i*i;j<N;j+=2*i)
            chk[j]=1;
    }
    for(i=2;i<N;i++)
    {
        if(chk[i]==0)
        {
            vec.pb(i);
        }
    }
}
*/


ll a[N];

int main()
{
    ll n,i,j,k,cnt=0;
    cin>>n;
    for1(i,n)
    {
        cin>>a[i];
    }

    for(i=1;i<=n;i++)
    {
        for(j=i+1;j<=n;j++)
        {
            for(k=j+1;k<=n;k++)
            {
                if(i!=j && j!=k && k!=i)
                {
                    if(a[i]+a[j]>a[k] && a[i]+a[k]>a[j] && a[j]+a[k]>a[i] && a[i]!=a[j] && a[i]!=a[k] && a[j]!=a[k])
                        cnt++;
                }
            }
        }
    }
    cout<<cnt<<endl;
    return 0;
}





















Measured memory_bytes: 3596