L = int(input())    
N = int(input())
blocks = list(map(int, input().split()))
blocks = sorted(blocks)

count = 0
while blocks:
    if L > 0:
        L = L - blocks[0]
        count = count + 1
        blocks.pop(0)
    else:
        break
    
if L < 0 :
    print(count - 1) 
else:
    print(count)