import algorithm, strutils, sequtils

let l = stdin.readLine().parseInt()
discard stdin.readLine()
let sortedW = stdin.readLine().split(' ').map(parseInt).sorted(proc (x, y: int): int = x - y)

var
  sum: int = 0
  maxBoxNum: int = len(sortedW)
for idx, w in sortedW:
  sum += w
  if sum > l:
    maxBoxNum = idx
    break

echo maxBoxNum