#include <fstream>

using namespace std;
ifstream fin("nrtri.in");
ofstream fout("nrtri.out");
unsigned short l1,l2,l3,n,nrt,l[801];
int main()
{
    fin>>n;
    for(l1=1;l1<=n;l1++)
            fin>>l[l1];
    nrt=0;
    for(l1=1;l1<=n;l1++)
        for(l2=1;l2<=n;l2++)
            for(l3=1;l3<=n;l3++)
                if(l1!=l2&&l1!=l3&&l2!=l3&&l[l1]+l[l2]>l[l3]&&l[l2]+l[l3]>l[l1]&&l[l1]+l[l3]>l[l2])
                    nrt++;
    fout<<nrt/3<<'\n';
    return 0;
}