#1行目
width = int(input())

#2行目
blocknum = int(input())

#3行目
blocksize = list(map(int, input().split()))
blocksize.sort()

sum_size = 0
ans = 0
for n in range(blocknum):
    sum_size += int(blocksize[n])
    if width >= sum_size:
        ans += 1
    else:
        break
        
print(ans)