MODE = "stdio"

tmp = Array.new




if(defined? MODE)
  tmp = STDIN.read.split("\n")
else
  iotmp = "\
  100
  10
  14 85 77 26 50 45 66 79 10 3
  ".split("\n")
  iotmp.each{|s|
    tmp << s.strip
  }
end

w = tmp[0].to_i
n = tmp[1].to_i

blocks = tmp[2].split(" ").map(&:to_i)

blocks.sort!

cnt = 0
blocks.each do |b|
  w -= b
  cnt += 1 if w>=0
end

puts cnt