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REPEAT X TIMES ( REPEAT X TIMES ( INCREASE O ) )
PRINT X

REPEAT O TIMES (
  CLEAR Q
  CLEAR P
  REPEAT X TIMES (
    REPEAT P TIMES ( CLEAR Q INCREASE Q )
    CLEAR P INCREASE P
  )
  REPEAT Q TIMES (
    CLEAR N CLEAR M CLEAR B CLEAR C CLEAR A 
    INCREASE B
    REPEAT X TIMES (
      CLEAR C REPEAT A TIMES ( INCREASE C )
      REPEAT B TIMES (
        INCREASE N
        CLEAR B
        INCREASE A
      )
      REPEAT C TIMES (
        CLEAR A
        INCREASE B
        INCREASE M
      )
    )
    #PRINT N
    #PRINT M

    #n-m optimoitavissa
    CLEAR S REPEAT N TIMES ( INCREASE S )
    REPEAT M TIMES (
      CLEAR W REPEAT S TIMES ( INCREASE W )
      CLEAR K
      CLEAR S
      REPEAT W TIMES (
        REPEAT K TIMES (
          INCREASE S
        )
        CLEAR K
        INCREASE K
      )
    )
    #PRINT L
    CLEAR L
    INCREASE L
    REPEAT S TIMES ( CLEAR L )
    #PRINT N PRINT M
    #PRINT E
    REPEAT L TIMES ( CLEAR X REPEAT N TIMES ( INCREASE X )
    PRINT X )
    #PRINT E
    #3x+1
    REPEAT S TIMES (
      REPEAT X TIMES ( INCREASE Y )
      REPEAT X TIMES ( INCREASE Y )
      REPEAT Y TIMES ( INCREASE X )
      INCREASE X
      PRINT X
    )
  )
)

Test 1 (public)

Verdict: ACCEPTED