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


def main():
    box_size = int(input())
    block_num = input()
    block_size = input().split()
    block_list = []

    for i in block_size:
        block_list.append(int(i))

    block_list.sort()
    answer = 0
    test = 0
    for j in block_list:
        test += j
        if test > box_size:
            print(answer)
            sys.exit()
        else:
            answer += 1

if __name__ == '__main__':
    import sys
    main()