program fractii;
var a,b,s,s1,a1,b1,r:longint;
    n:longint;
    f,g:text;
function cmmdc(a1,b1:longint):longint;
var r:longint;
begin
     repeat
           r:=a1 mod b1;
           a1:=b1;
           b1:=r;
     until r=0;
     cmmdc:=a1;
end;
begin
     assign(f,'fractii.in');
     assign(g,'fractii.out');
     reset(f);
     rewrite(g);
     read(f,n);
     s:=n+(n-1);
     for a:=1 to n do
     begin
          s1:=0;
          for b:=2 to a-1 do
          begin
               a1:=a;
               b1:=b;
               if (cmmdc(a1,b1)<>1) then inc(s1);
          end;
     end;
     s:=s+s1;
     write(g,s);
     close(f);
     close(g);
end.