V = gets.split.map(&:to_i).sort

def f(nums)
  dp = Array.new(31, Float::INFINITY)
  dp[0] = 0

  30.times do |i|
    c = dp[i] + 1

    nums.each do |n|
      m = i + n
      next if m > 30

      dp[m] = c if dp[m] > c
    end
  end

  V.map { |v| dp[v] }.sum
end

ans = Float::INFINITY

[*1..30].combination(3) do |nums|
  v = f(nums)
  ans = v if ans > v
end

puts ans