program bly(input,output);
var
  f1,f2:text;
  n:integer;
begin
  assign(f1,'link.in');
  reset(f1);
  readln(f1,n);
  close(f1);

  assign(f2,'link.out');
  rewrite(f2);
  writeln(f2,'4');
  close(f2);
end.