#ifndef PIN
   #error Please compile with -DPIN=<number>
#else
   #ifndef _
      #define _ __FILE__

      /* Initialize PIN bits */
      #if PIN % 2 > 0
         #define BIT0
      #endif
      #if PIN % 4 > 1
         #define BIT1
      #endif

      /* Data array */
      static const unsigned char data[] = {0
         #define OUTPUT_BYTE
         #define STEP0
         #include _

         #define OUTPUT_BYTE
         #define STEP1
         #include _

         #define OUTPUT_BYTE
         #define STEP0
         #define STEP1
         #include _

         #define OUTPUT_BYTE
         #define STEP2
         #include _
      };

      /* Output data */
      #include<stdio.h>
      int main() { return !fwrite(data, 4, 1, stdout); }
   #else
      #ifdef OUTPUT_BYTE
         #undef OUTPUT_BYTE

         /* Repeat PRNG steps. */
         #include _

         /* Serialize PRNG bits to bytes. */
         #ifdef BIT0
            |1
         #endif
         #ifdef BIT1
            |2
         #endif

         /* Start next byte. */
         ,0
      #else
         /* Run PRNG steps.
            
            We want to interpret STEP* as bits that encode counter
            for number of steps to run.  STEP2 is the highest order
            bit, so it should run STEP1 twice.                      */
         #ifdef STEP2
            /* Consume the highest order bit */
            #undef STEP2

            /* Get rid of lower-order bit steps such that if the
               number starts with 1xx, we will reach 100 by recursively
               processing the lower order bits.                         */
            #include _

            /* Now we do the steps to multiply STEP1 twice, first time */
            #define STEP1
            #include _

            /* Second time (fall through) */
            #define STEP1
         #endif

         #ifdef STEP1
            #undef STEP1
            #include _
            #define STEP0
            #include _
            #define STEP0
         #endif

         #ifdef STEP0
            #undef STEP0

            /* Run a single step of PRNG. */
            #undef BIT2
            #ifdef BIT1
               #ifndef BIT0
                  #define BIT2
               #endif
            #else
               #ifdef BIT0
                  #define BIT2
               #endif
            #endif

            #undef BIT0
            #ifdef BIT1
               #define BIT0
            #endif
            #undef BIT1
            #ifdef BIT2
               #define BIT1
            #endif
         #endif
      #endif
   #endif
#endif