def resolve():
    n = int(input())
    a = [list(map(int, input().split())) for _ in range(2)]
    x = list(map(int, input().split()))
    y = list(map(int, input().split()))
    dp = [0] * (n + 1)
    for i in range(n):
        for j in range(2):
            for k in range(2):
                z = a[j][i * 2] + a[k][i * 2 + 1]
                z += x[i] if j == k else y[i]
                if dp[i] + z > dp[i + 1]:
                    dp[i + 1] = dp[i] + z
    print(dp[-1])


if __name__ == "__main__":
    resolve()