#!/usr/bin/env python
#coding:UTF-8

L = int(raw_input())
N = int(raw_input())
W = map(int,raw_input().split())
W2 = sorted(W)

sum = 0
count = 0

for I in range(0,N):
     sum = sum + W2[I]
     if L < sum:
          break
     else:
          count += 1

print count