# no.5 numeric blocks
# https://yukicoder.me/problems/no/5

box_width = gets.to_i
box_num = gets.to_i

gets.split.map(&:to_i).sort!.each_with_index{|b_w, index|
    if (box_width -= b_w) < 0
        puts index
        return
    end
}
puts box_num