import sys

storageBox = int(input())
noBoxes = int(input())
boxes = list(map(lambda x: int(x), input().split(None)))

boxes.sort()

capacity = 0
count = 0

for i in boxes:
    
    capacity = capacity + i
    
    if capacity > storageBox:
        break
    
    count = count + 1
    
    if capacity == storageBox:
        break

print(count)