MAX = int(input())
NUM = input()
blocks = list(input().split())
#print("blocks", blocks)
blocks_i = [int(s) for s in blocks]
blocks_i.sort()
#print("blocks_i", blocks_i)
n = 0
while MAX > blocks_i[n]:
    MAX = MAX - blocks_i[n]
#    print(n+1, blocks_i[n],"MAX",MAX)
    n += 1
print(n)