DEFINE PROCEDURE ''DIVIDE'' [A,B]:
BLOCK 0: BEGIN
  IF A < B, THEN:
    QUIT BLOCK 0;
  CELL(0) <= 1;
  OUTPUT <= 1;
  LOOP AT MOST A TIMES:
  BLOCK 2: BEGIN
    IF OUTPUT * B = A, THEN:
    QUIT BLOCK 0;
    OUTPUT <= OUTPUT + 1;
    IF OUTPUT * B > A, THEN:
    BLOCK 3: BEGIN
      OUTPUT <= CELL(0);
      QUIT BLOCK 0;
    BLOCK 3: END;
    CELL(0) <= OUTPUT;
  BLOCK 2: END;
BLOCK 0: END.

DEFINE PROCEDURE ''MINUS'' [A,B]:
BLOCK 0: BEGIN
  IF A < B, THEN:
    QUIT BLOCK 0;
  LOOP AT MOST A TIMES:
  BLOCK 1: BEGIN
    IF OUTPUT + B = A, THEN:
      QUIT BLOCK 0;
    OUTPUT <= OUTPUT + 1;
  BLOCK 1: END;
BLOCK 0: END.

DEFINE PROCEDURE ''MODULUS'' [A,B]:
BLOCK 0: BEGIN
  CELL(0) <= DIVIDE[A,B];
  OUTPUT <= MINUS[A,CELL(0) * B];
BLOCK 0: END.



DEFINE PROCEDURE ''TOGGLE'' [DOOR]:
BLOCK 0: BEGIN
  IF DOOR = 1, THEN:
    QUIT BLOCK 0;
  OUTPUT <= 1;
BLOCK 0: END.

DEFINE PROCEDURE ''NUMBERS'' [DOOR, COUNT]:
BLOCK 0: BEGIN
  CELL(0) <= 1; /*each number*/
  OUTPUT <= 0; /*current door state*/
  
  LOOP COUNT TIMES:
  BLOCK 1: BEGIN

    IF MODULUS[DOOR, CELL(0)] = 0, THEN:
      OUTPUT <= TOGGLE[OUTPUT];
    
    CELL(0) <= CELL(0) + 1;

  BLOCK 1: END;

BLOCK 0: END.

DEFINE PROCEDURE ''DOORS'' [COUNT]:
BLOCK 0: BEGIN

  CELL(0) <= 1; /*each door*/
  LOOP COUNT TIMES:
  BLOCK 1: BEGIN

    CELL(1) <= NUMBERS[CELL(0), COUNT];  /*iterate over the states of this door to get its final state*/
    IF CELL(1) = 1, THEN: /*door state = open*/
      PRINT[CELL(0), '   '];
    
    CELL(0) <= CELL(0) + 1;

  BLOCK 1: END;
BLOCK 0: END.

DOORS[100];