#include <stdio.h>
#include <X11/extensions/Xrandr.h>

int main() {
  Display *dpy;
  XRRScreenResources *resources;
  XRROutputInfo *info;
  
  dpy = XOpenDisplay (NULL);
  resources = XRRGetScreenResources (dpy, DefaultRootWindow (dpy));
  info = XRRGetOutputInfo (dpy, resources, resources->outputs[0]);
  printf ("%d\n", info->npreferred);
  XRRFreeOutputInfo (info);
  XRRFreeScreenResources (resources);
  
  return 0;
}