#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>

int main() {

  printf("%x\n", O_RDONLY);
  printf("%x\n", O_WRONLY);
  printf("%x\n", O_DIRECTORY);
  printf("%x\n", O_NOFOLLOW);
  return 0;
}