(define (System.out.println x)
  (begin
    (write x)
    (newline)
  )
)

(define (find-vec vec foo)
  (let loop(
            (i 0)
           )
    (if (= i (vector-length vec))
        -1
        (if (= foo (vector-ref vec i))
            i
            (loop (+ i 1))
        )
    )
  )
)

(define (ItemCheckA vec i)
  (let loop(
            (foo (read))
            (bar 0)
            (PowUp 0)
           )
    (if (> (find-vec vec foo) -1)
        (begin
          (vector-set! vec (+ i bar) 0)
          (vector-set! vec (find-vec vec foo) 0)
          (if (= bar 2)
              (+ PowUp 1)
              (loop (read) (+ bar 1) (+ PowUp 1))
           )
          )
        (begin
          (vector-set! vec (+ i bar) foo)
          (if (= bar 2)
              PowUp
              (loop (read) (+ bar 1) PowUp)
          )
        )
    )
  )
)

(define (ItemCheckB vec)
  (let loop(
            (i     0)
            (Cnt   0)
            (PowUp 0)
           )
    (if (= i (vector-length vec))
        PowUp
        (if (< 0 (vector-ref vec i))
            (begin
              (vector-set! vec i 0)
              (if (= Cnt 3)
                  (loop (+ i 1) 0 (+ PowUp 1))
                  (loop (+ i 1) (+ Cnt 1) PowUp)
              )
            )
            (loop (+ i 1) Cnt PowUp)
        )
    )
  )
)
            
            

(let loop(
          (vec (make-vector (* (read) 3)))
          (i     0)
          (PowUp 0)
         )
    (if (= i (vector-length vec))
        (System.out.println (number->string (+ (ItemCheckB vec) PowUp)))
        (loop vec (+ i 3) (+ PowUp (ItemCheckA vec i)))
    )
)