#coding=UTF-8
#greedyかしら

L=int(input())
N=int(input())
mojir=input()
blocks=[]
for monomoji in mojir.split(' '):
    blocks.append(int(monomoji))

kireiblocks=sorted(blocks)
irehaba=0
ans=0
for mono in kireiblocks:
    irehaba=irehaba+mono
    if irehaba > L:
        break
    ans=ans+1
print(ans)