def equal(arr)
  sum = 1_000_000_000
  min = arr.min
  [0, 1, 2].each do |target|
    cur_sum = 0
    arr.each do |num|
      diff = num + target - min
      cur_sum += diff / 5 + diff % 5 / 2 + diff % 5 % 2 / 1
    end
    sum = cur_sum if cur_sum < sum
  end
  puts sum
end