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

(define foo
  (let loop(
            (i 0)
            (j 0)
            (prime (list 2 3 5 7 11 13))
            (comp  (list 4 6 8 9 10 12))
            (ls '())
           )
    (if (= i 6)
        ls
        (loop (+ i (floor (/ j 5))) (modulo (+ j 1) 6) prime comp (cons (* (list-ref prime i) (list-ref comp j)) ls))
    )
  )
)

(define (CntCase x)
  (let loop(
            (i 0)
            (Matched 0)
           )
    (if (= i 36)
        Matched
        (if (= x (list-ref foo i))
            (loop (+ i 1) (+ Matched 1))
            (loop (+ i 1) Matched)
        )
    )
  )
)

(System.out.println (exact->inexact (/ (CntCase (read)) 36)))