#include <iostream>
#include <fstream>
using namespace std;
ifstream f("nrtri.in");
ofstream g("nrtri.out");
long long a[25001],i,j,k,n,nr=0;
int main()
{
    f>>n;
    for(i=1;i<=n;i++)
    f>>a[i];
    for (i=1;i<=n-2;i++)
    {
        for (j=i+1;j<=n-1;j++)
        {
            for (k=j+1;k<=n;k++)
            {
                if ( (a[j]-a[i]>=0) && (a[k]-a[j]>=0) && (a[k]-a[i]>=0) )
                {
                    nr++;
                }
            }
        }
    }
    g<<nr;
    return 0;
}