length = gets.chomp.to_i
num = gets.chomp.to_i
blocks = gets.split.map(&:to_i)
sum = 0
cnt = 0
blocks.sort!
blocks.each do |i|
	sum += i	
	cnt += 1
	if length < sum
		puts cnt - 1
		break
	end
	if cnt == num
		puts cnt
		break
	end
end