PRINT X
INCREASE A
CLEAR A
INCREASE C
CLEAR C
INCREASE B
REPEAT X TIMES (
     REPEAT A TIMES ( 
          INCREASE B
          CLEAR A
    )
    REPEAT C TIMES ( 
          INCREASE A
          CLEAR C
    )
    REPEAT B TIMES ( 
          INCREASE C
            CLEAR B
    )
    PRINT B
)