#include<stdio.h>

#define  SYSTEM   5

#if     SYSTEM == 1
  #define  HDR 10
#elif SYSTEM == 2
  #define  HDR  20
#elif SYSTEM == 3 
  #define  HDR  30
/*#else
  #define  HDR  0*/
#endif

#if !defined(HDR)
#define HDR 50
#endif  


int main()

{
printf("HDR = %d \n", HDR);
return 0;
}