N = gets.to_i
A = gets.split.map(&:to_i)
B = gets.split.map(&:to_i)
X = gets.split.map(&:to_i)
Y = gets.split.map(&:to_i)

sum = 0
N.times do |i|
  sum += A[2 * i] + A[2 * i + 1] + X[i]
end

dp = Array.new(N + 1, sum)

N.times do |i|
  # dobule red
  if dp[i + 1] < dp[i]
    dp[i + 1] = dp[i]
  end

  # one red one blud
  if dp[i + 1] < dp[i] + (Y[i] - X[i]) + (B[2 * i] - A[2 * i])
    dp[i + 1] = dp[i] + (Y[i] - X[i]) + (B[2 * i] - A[2 * i])
  end

  # one blue one red
  if dp[i + 1] < dp[i] + (Y[i] - X[i]) + (B[2 * i + 1] - A[2 * i + 1])
    dp[i + 1] = dp[i] + (Y[i] - X[i]) + (B[2 * i + 1] - A[2 * i + 1])
  end

  # double blue
  if dp[i + 1] < dp[i] + (B[2 * i] - A[2 * i]) + (B[2 * i + 1] - A[2 * i + 1])
    dp[i + 1] = dp[i] + (B[2 * i] - A[2 * i]) + (B[2 * i + 1] - A[2 * i + 1])
  end
end

pp dp.max