var n,nr,i,j:qword;
f,g: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);
assign(g,'fractii.out');rewrite(g);
read(f,n);
nr:=n;
i:=2;
while i<=n do begin
  j:=1;
    while j<=n do
      if cmmdc(i,j)<>1 then
        inc(j)
      else begin
      inc(nr);
      inc(j);
      end;
inc(i);
end;
writeln(g,nr);
close(g);
end.