(define Days(list 0 31 28 31 30 31 30 31 31 30 31 30))
(let (
          (Month 1)
          (Day 1)
          (HDcnt 0)
      )
     (let loop()
         (begin
             (if (and (= Month 11) (= Day 30))
                 (display HDcnt)
                 (begin
                     (when (= Day (list-ref Days Month))
                         (begin (set! Month (+ Month 1)) (set! Day 1)))
                     (when (= Month (+ (/ Day 10) (modulo Day 10)))
                         (set! HDcnt (+ HDcnt 1)))
                     (loop)
                  )
              )
         )
      )
)