#include<fstream>
using namespace std;
int main ()
{
   ifstream fin("nrtri.in");
   ofstream fout("nrtri.out");
   int i,n,v[805],p,aux,a,b,c,k;
    fin>>n;
    k=0;
    for(i=3;i<n+3;i++) fin>>v[i];
    do
    {
        p=1;
        v[0]=0;
        v[1]=0;
        v[2]=0;
        for(i=3;i<n+3;i++)
        {
            if(v[i]>v[i+1])
            {
                aux=v[i];
                v[i]=v[i+1];
                v[i+1]=aux;
                p=0;
            }
        }
    }while(p=0);
    for(a=3;a<n+3;a++)
    {
        for(b=a+1;b<n+3;b++)
        {
            for(c=b+1;c<n+3;c++)
            {
                if(v[a]<=v[b]+v[c] && v[b]<=v[a]+v[c] && v[c]<=v[a]+v[b] && v[a]!=v[a-3]
                   && v[b]!=v[b-3] && v[c]!=v[c-3])
                {
                    k++;
                }
            }
        }
    }
    fout<<k;

}