from collections import deque
L = int(input())
N = int(input())
"""if N == 1:
	w = deque([int(input())])
else:
"""
w = deque(sorted(map(int, input().split(" "))))
s = 0
while s <= L:
	try:
		s += w.popleft() 
	except IndexError:
		s.append(0)
		break
print(N - len(w) - 1)