input = gets
width = input.to_i
input = gets
number = input.to_i

input  = gets
block = input.chomp.split(" ")
block.map!(&:to_i)
block.sort!

sum = 0
number.times do |i|
 sum += block[i].to_i
 if sum > width then
   puts i
   break
 elsif i + 1 == number then
  puts i + 1
 end
end