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

def main():
    box_width = int(input())
    block_num = int(input())
    block_widths = sorted(list(map(int, input().split())))

    total_width = 0
    count = 0
    for width in block_widths:
        total_width = total_width + width

        if box_width <= total_width:
            break
        count = count + 1

    print(str(count) + "\n")
    

if __name__ == '__main__':
    main()