#include <fstream>

using namespace std;
int v[801];
ifstream cin ("nrtri.in");
ofstream cout ("nrtri.out");
int main()
{
    int n,cnt=0;
    cin>>n;
    for (int i=0;i<n;i++)
    {
        cin>>v[i];
    }
    for (int i=0;i<n;i++)
    {
       for (int j=0;j<i;j++)
       {
           for (int k=0;k<j;k++)
           {
               int a=v[i],b=v[j],c=v[k];
               if (a<=b+c&&c<=b+a&&b<=a+c&&i!=j&&j!=k&&k!=i)
                cnt++;
           }
       }
    }
    cout<<cnt;
    return 0;
}