L = int(input())
N = int(input())
W = input().split()
block = []
for i in W:
    block.append(int(i))
block.sort()
ans = []
full = 0
for j in range(len(block)):
    full += block[j]
    if full > L:
        break
    ans.append(block[j])
print(len(ans))