program fractii;
   var  n,p,q,i,l,max:longint;f,g:text;a:byte;
   begin
   assign(f,'fractii.in');reset(f);
   assign(g,'fractii.out');rewrite(g);
   readln(f,n);
   for p:=1 to n do begin
   q:=0;
   for q:=1 to n do begin
   if p>q then max:=p else max:=q;
   for i:=2 to max do
   if (p mod i=0)and(q mod i=0)then a:=1;
   if a=0 then inc(l); a:=0;
   end;
   end;
   write(g,l);
   close(f);
   close(g);
   end.