var n,p,q,m,i,cnt:longint;
    fr:real;
    v:array[1..10000] of real;
    egal:boolean;
    f,g:text;
begin
assign(f,'fractii.in');
assign(g,'fractii.out');
reset(f);
rewrite(g);
readln(f,n);
for p:=1 to n do
         for q:=1 to n do
                     begin
                       fr:=p/q;
                       egal:=false;
                       for i:=1 to m do
                                if v[i]=fr then egal:=true;
                       if not egal then
                              begin
                              inc(m);
                              v[m]:=fr;
                              inc(cnt);
                              end;
                     end;
write(g,cnt);
close(f);
close(g);
end.