var f:text;
    n,p,q,nr:longint;
    ok:boolean;
begin
assign(f,'fractii.in');
reset(f);
read(f,n);
close(f);
nr:=2*n-1;
for p:=2 to n do
    for q:=2 to n do
        if (p mod q<>0)and(q mod p<>0) then
           inc(nr);
assign(f,'fractii.out');
rewrite(f);
write(f,nr);
close(f);
end.