def solve(vs, mat)
  used = Array.new(5, false)
  5.times do |i|
    pivot = -1
    5.times do |j|
      next if used[j]
      next if mat[j][i].abs < 1e-8
      if pivot == -1 || mat[pivot][i].abs > mat[j][i].abs
        pivot = j
      end
    end
    return 0 if pivot == -1
    (i + 1).upto(5) do |j|
      mat[pivot][j] /= mat[pivot][i]
    end
    mat[pivot][i] = 1.0
    5.times do |j|
      next if j == pivot
      next if mat[j][i] == 0
      (i + 1).upto(5) do |k|
        mat[j][k] -= mat[j][i] * mat[pivot][k]
      end
      mat[j][i] = 0
    end
    used[pivot] = true
  end
  5.times do |i|
    return 0 if mat[i][5] < -1e-8
  end
  cs = mat.map { |row| row[5].to_i }
  ret = 0
  [0, cs[0] - 2].max.upto(cs[0] + 1) do |c0|
    [0, cs[1] - 2].max.upto(cs[1] + 1) do |c1|
      [0, cs[2] - 2].max.upto(cs[2] + 1) do |c2|
        [0, cs[3] - 2].max.upto(cs[3] + 1) do |c3|
          [0, cs[4] - 2].max.upto(cs[4] + 1) do |c4|
            next if c4 + c0 + c1 > vs[0]
            next if c0 + c1 + c2 > vs[1]
            next if c1 + c2 + c3 > vs[2]
            next if c2 + c3 + c4 > vs[3]
            next if c3 + c4 + c0 > vs[4]
            ret = [ret, c0 + c1 + c2 + c3 + c4].max
          end
        end
      end
    end
  end
  return ret
end

vs = readline.split.map(&:to_i)
es = []
5.times do |i|
  e = [0.0] * 6
  e[5] = vs[i].to_f
  e[i - 1] = e[i] = e[(i + 1) % 5] = 1
  es << e
  e = [0.0] * 6
  e[i] = 1
  es << e
end
ans = 0
(1 << 10).times do |i|
  next if i.to_s(2).count("1") != 5
  mat = []
  10.times do |j|
    if (i & (1 << j)) != 0
      mat << es[j].clone
    end
  end
  ans = [ans, solve(vs, mat)].max
end
puts ans