var f,g:text;
    nr,n,i,j:longint;
begin
assign(f,'fractii.in');reset(f);
assign(g,'fractii.out');rewrite(g);
read(f,n);
nr:=n*(n-1);
for i:=2 to n-1 do
    for j:=i+1 to n do
        if j mod i=0 then dec(nr,2);
writeln(g,nr+1);
close(f);
close(g);
end.