var n,i,j,fr,a,b,r:longint;
begin
assign(input,'fractii.in');reset(input);
assign(output,'fractii.out');rewrite(output);
read(n);
i:=0;
j:=1;
a:=0;
b:=0;
r:=0;
fr:=n;
for i:=2 to n do begin
   j:=1;
 while j<=n do begin
 if j=1 then inc(fr)
 else begin
 a:=i;
 b:=j;
 while a mod b<>0 do begin
 r:=a mod b;
 a:=b;
 b:=r;
 end;
 if b=1 then inc(fr);
 end;
 inc(j);
 end;
 end;
write(fr);
close(output);
end.