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#include<fstream>
using namespace std;
int main ()
{
ifstream fin("nrtri.in");
ofstream fout("nrtri.out");
int i,n,v[155],p,aux,a,b,c,k;
fin>>n;
k=0;
for(i=0;i<n;i++) fin>>v[i];
do
{
p=1;
v[0]=0;
v[1]=0;
v[2]=0;
for(i=3;i<n;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;a++)
{
for(b=a+1;b<n;b++)
{
for(c=b+1;c<n;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;
}