#include <fstream>
#include <cstdio>
using namespace std;
int n,i,v[810],j,k,nr;
int main(){
    freopen("nrtri.in","r",stdin);
    ofstream g ("nrtri.out");
    scanf("%d",&n);
    for(i=1;i<=n;++i)
    scanf("%d",&v[i]);
    for(i=1;i<=n;++i)
    for(j=1;j<=n;++j)
    for(k=1;k<=n;++k)
    if(i!=j&&j!=k&&k!=i&&v[i]+v[j]>v[k]&&v[i]+v[k]>v[j]&&v[j]+v[k]>v[i])++nr;
    g<<nr/3;
    return 0;}