program problema;
var f,g:text;
n,nr,j,i:integer;
begin
assign(f,'fractii.in');reset(f);
assign(g,'fractii.out');rewrite(g);
nr:=1;
 while not eoln(f) do
begin
readln(f,n);
for i:=1 to n do
begin
for j:=1 to n do
if frac(i/j) <> 0 then nr:=nr+1;
end;
end;
write(g,nr);
close(f);
close(g);
end.