var a:array[1..30000] of integer;
aux,i,j,k,nr,n:integer;
f,g:text;
begin
assign(f,'nrtri.in');reset(f);
assign(g,'nrtri.out');rewrite(g);
readln(f,n);
nr:=0;
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-1 do
for k:=j+1 to n-2 do
if (a[i]>0) and (a[j]<>0) and (a[k]<>0) and {(a[i]<>a[j]) and (a[i]<>a[k]) and (a[j]<>a[k]) and }
(a[i]+a[j]>=a[k]) and (a[k]+a[j]>=a[i]) and (a[i]+a[k]>=a[j]) then inc(nr);
write(g,nr);
close(f);
close(g);
end.