V0, V1, V2, V3 = gets.split.map(&:to_i)
D = [*1..30]
def f(v, a, b, c)
  @dp ||= {}
  @dp[[v, a, b, c]] ||= if v < 0
                          Float::INFINITY
                        elsif v == 0
                          0
                        else
                          [f(v - a, a, b, c), f(v - b, a, b, c), f(v - c, a, b, c)].min + 1
                        end
end
ans = D.product(D, D).map {|a, b, c|
  f(V0, a, b, c) + f(V1, a, b, c) + f(V2, a, b, c) + f(V3, a, b, c)
}.min
puts ans