# coding: utf-8
# Your code here!

all_length = int(input())
num = int(input())
length_arr = [int(x) for x in input().split()]
length_arr.sort()

ct = 0
for i in range(len(length_arr)):
    if all_length - length_arr[i] >= 0:
        all_length -= length_arr[i]
        ct += 1
    else:
        break

print(ct)