program fractii;
var n,i,j,nr:longint;
f:text;

function cmmdc(a,b:longint):longint;
var r:longint;
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);
read(f,n);
close(f);

nr:=0;
for i:=1 to n do
  for j:=1 to n do
    if cmmdc(i,j)=1 then
      nr:=nr+1;

assign(f,'fractii.out');
rewrite(f);
write(f,nr);
close(f)
end.