#include <stdio.h>
#include <stdlib.h>

int main()
{   
	int n,d=0,i,j,l,a;
	int e[30004];
	FILE *f1,*f2;
	f1=fopen("nrtri.in","r");
	f2=fopen("nrtri.out","w");
	fscanf(f1,"%d",&n);
	for(i=1;i<=n;i++)
	{
		fscanf(f1,"%d",&a);
		e[a]++;
	}
	for(i=1;i<=n;i++)
	{
		if(e[i])
				for(j=i+1;j<=n;j++)
				{
					if(e[j])
						for(l=j+1;l<=n;l++)
						{
							if(e[l])
							{
								if(e[l]<=e[j]+e[i] && e[j]<=e[l]+e[i] && e[i]<=e[l]+e[j])
								d++;
							}
						}
				}
	}
	
	fprintf(f2,"%d",d);
	fclose(f1);
	fclose(f2);

	return 0;
}