#include<fstream.h>
#define endl '\n'

int main()
{
int n,v[801]={0},i,j1,j2,j3,c=0;
ifstream fin("nrtri.in");
ofstream fout("nrtri.out");
fin>>n;
for(i=1;i<=n;i++)
  fin>>v[i];
for(j1=1;j1<=n;j1++)
  for(j2=j1+1;j2<=n;j2++)
    for(j3=1;j3<=n;j3++)
      if(v[j1]+v[j2]>=v[j3])
	if(j1!=j3&&j2!=j3)
	  if(v[j3]>=v[j2]&&v[j3]>=v[j1])
	    c++;
fout<<c;
return 0;
}