program fractii;
var i,j,nr,n,r,a,b:longint;
    f,g:text;
begin
assign(f,'fractii.in');reset(f);
assign(g,'fractii.out');rewrite(g);
read(f,n);
nr:=1;
for i:=1 to n do
   for j:=i+1 to n do
    begin
       a:=i;
       b:=j;
       repeat
       r:=a mod b;
       a:=b;
       b:=r;
       until r=0;
       if a=1 then nr:=nr+2;
   end;
write(g,nr);
close(f);
close(g);
end.