var a:array[1..30000] of integer;
aux,i,j,k,m,n:integer;
f,g:text;
begin
assign(f,'nrtri.in');reset(f);
assign(g,'nrtri.out');rewrite(g);
read(f,n);
for i:=1 to n do read(f,a[i]);
for i:=1 to n-1 do
for j:=i+1 to n do
if a[i]>a[j] then begin
aux:=a[i];
a[i]:=a[j];
a[j]:=aux;
end;
for i:=1 to n do
for j:=i+1 to n do
for k:=j+1 to n do
if (a[i]+a[j]>=a[k]) and (a[i]<>a[j]) and (a[j]<>a[k]) and (a[i]<>a[k]) then inc(m);
write(g,m);
close(f);
close(g);
end.