program p1;
var n,nr,i,j:1..1000000;
    f,g:text;
begin
assign(f,'fractii.in');reset(f);
assign(g,'fractii.out');rewrite(g);
readln(f,n);
nr:=n*n;
for i:=2 to n do
    for j:=2 to n do
        begin
        if (i mod j =0) then dec(nr);
        if (j mod i=0)and(i<>j) then dec(nr);
        end;
writeln(g,nr);
close(f);
close(g);
end.