# -*- coding: utf-8 -*-
__author__ = 'yuuki'
#No.5 数字のブロック

i = 0
C = 0
L = int(input())
N = int(input())
W = map(int,raw_input().split())
W.sort()

for i in xrange(len(W)):
    C += W[i]
    if C == L:
        print i + 1
        break
    elif C > L:
        print i
        break

if C < L:
    print len(W)