program Fractii;
var t:text;p,q,c,n,a,b:integer;
begin
 assign(t,'fractii.in');
 reset(t);
 read(t,n);
 c := 0;
 for p := 1 to n do
  for q := 1 to n do
  begin
  a := p;
  b := q;
  while a <> b do
  begin
    if a > b then a := a - b;
    if b > a then b := b - a;
  end;
  if a = 1 then c := c + 1;
  end;
 assign(t,'fractii.out');
 rewrite(t);
 write(t,c);
end.