box_width = gets.to_i
box_num = gets.to_i
blocks = gets.split.map(&:to_i)
count_box_num = 0

blocks.sort!

blocks.map{|s|
    box_width -= s
    if box_width < 0
        puts count_box_num
        return
    else
        count_box_num += 1
    end
}