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

#A, B = map(int, raw_input().split())
#S = raw_input()
L = int(raw_input())
n = raw_input()
array = map(int, raw_input().split())

###
sum = 0
n = 0
array.sort()

for i in array:
       	sum += i
       	if sum > L:
       		print n
       		break
       	else:
       		n += 1
else:
       	print n