# Read input
k, n = gets.not_nil!.split.map(&.to_i)

# Read array of n integers
a = Array(Int32).new(n)
n.times do |i|
  a[i] = gets.not_nil!.to_i
end

# Sort the array
a.sort!

# Process elements
(0...n).each do |i|
  k -= a[i]
  if k < 0
    puts i
    exit
  end
end

puts n