inp1 = input()
inp_dust = input()
inp2 = input().split()

seq= []
for s in inp2:
    seq.append(int(s))

seq = sorted(seq)
num = int(inp1)

box = 0
count = 0
for s in seq:
    box = box + s
    count = count + 1
    if box == num:
        break
    elif box >= num:
        count = count - 1
        break


print(count)