(define (iota n . args)
  (let ((start (if (pair? args) (car args) 0))
        (step  (if (and (pair? args) (pair? (cdr args))) (cadr args) 1)))
    (let loop ((m n) (last (+ start (* step (- n 1)))) (a '()))
      (if (zero? m)
          a
	  (loop (- m 1) (- last step) (cons last a))))))

(write (let* ((L (read)) (N (read)) (W (sort (map (lambda (x) (read)) (iota N)) <)))
	 (let loop((a W) (sum 0) (res 0))
	   (if (null? a)
	       res
	       (let ((next-sum (+ sum (car a))))
		 (if (<= next-sum L)
		     (loop (cdr a) next-sum (+ res 1))
		     res))))))
(newline)