var n,i,j:longint;
nr:longint;
f,g:text;
begin
assign(f,'fractii.in');reset(f);
assign(g,'fractii.out');rewrite(g);
read(f,n);
i:=2;
nr:=n;
while i<=n do begin
  j:=1;
    while j<=n do begin
    if i>j then
        if (i mod j=0) and (i div j<>i) then
          inc(j)
        else begin
        inc(nr);
        inc(j);
        end
    else
        if j>i then
          if (j mod i=0) and (j div i<>j) then
            inc(j)
          else begin
          inc(nr);
          inc(j);
          end
    else
    inc(j);
end;
inc(i);

end;
writeln(g,nr);
close(g);
end.