l = gets.chomp.to_i
n = gets.chomp.to_i
ary = []
ary1 = []
a = 0
b = 0

ary = gets.chomp.split

ary.each do |i|
ary1 << i.to_i
end

ary1.sort.each do |i|
  if a < l
    a += i
    b += 1
  end
end

puts b - 1