#!/usr/bin/python
# coding: utf-8

###
import sys
file = sys.argv[1]
###
line = open(file).read().split('\n')
l = int(line[0])
n = int(line[1])
ary = map(int, line[2].split(" "))

ary.sort()
sum = 0
n = 0
for i in ary:
       	sum += i
       	if sum > l:
       		print n
       		break
       	else:
       		n += 1
else:
       	print n