width = int(input())
n = int(input())
blocks = sorted(list(map(int, input().split())))

block_sum = 0
block_count = 0
for i in range(n):
    if width >= block_sum + blocks[i]:
        block_sum += blocks[i]
        block_count += 1
    elif width == block_sum + blocks[i]:
        block_count += 1
        break
    else:
        break
print(block_count)