program fractii;
var f, g:text;
v:array[1..1000000] of integer;
i, j, n, nr:integer;
function cmmdc(a, b:integer):integer;
var r:integer;
begin
while b<>0 do
begin
r:=a mod b;
a:=b;
b:=r;
end;
cmmdc:=a;
end;
begin
assign(f, 'fractii.in'); reset(f);
assign(g, 'fractii.out'); rewrite(g);
read(f, n);
for i:=1 to n do v[i]:=i;
nr:=0;
for i:=1 to n do
begin
for j:=1 to n do if cmmdc(i, j)=1 then inc(nr);
end;
write(g, nr);
close(f); close(g);
end.