program fractii;
var f,g:text;
    n,c,i,j,ci,cj:longint;
begin
assign(f,'fractii.in');
assign(g,'fractii.out');
reset(f);
rewrite(g);
read(f,n);
c:=n;
for i:=2 to n do
  begin
    for j:=i to n do
      begin
        ci:=i;
        cj:=j;
        while (ci<>cj)do
          if (ci>cj)then ci:=ci-cj else cj:=cj-ci;
        if (ci=1)then c:=c+1;
      end;
  end;
write(g,c);
close(f);
close(g);
end.