#coding: utf-8
##yuki_5

l=int(raw_input())
n=int(raw_input())
w=map(int,raw_input().split())

w.sort()
res=0
count=0
for i in xrange(n):
 if res<l:
  res+=w[i]
  count+=1
 else:
  break
 
print count-1