#include<iostream>
#include<fstream>
int v[30001];
using namespace std;
int main()
{
	ifstream f("nrtri.in");
	ofstream g("nrtri.out");
	int i,n,a=0,k,j;
	f>>n;
	for(i=1;i<=n;i++)
	{
		f>>v[i];}
	for(i=1;i<=n;i++)
		for(j=i+1;j<=n;j++)
			for(k=j+1;k<=n;k++)
				if((v[i]+v[j]>v[j+1])&&(v[i]+v[j+1]>v[j])&&(v[j]+v[j+1]>v[i])&&v[i]!=v[j]&&v[j]!=v[k])a++;
	g<<a;
	return 0;
}