# -*- coding: utf-8 -*-

def main():
    l = int(input())
    n = int(input())
    ws = sorted(map(int, input().split()))
    w_sum = 0
    c = 0
    for i in ws:
        w_sum += i
        c += 1
        if l <= w_sum:
            print(c)
            return c

if __name__ == '__main__':
    main()