As an experiment the Educational Codeforces Round 33 will be rated for Div. 2.
×

Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only ACM-ICPC mode for virtual contests.
If you've seen these problems, a virtual contest is not for you - solve these problems in the archive.
If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive.
Never use someone else's code, read the tutorials or communicate with other person during a virtual contest.

No tag edit access

D. Dima and Hares

time limit per test

2 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputDima liked the present he got from Inna very much. He liked the present he got from Seryozha even more.

Dima felt so grateful to Inna about the present that he decided to buy her *n* hares. Inna was very happy. She lined up the hares in a row, numbered them from 1 to *n* from left to right and started feeding them with carrots. Inna was determined to feed each hare exactly once. But in what order should she feed them?

Inna noticed that each hare radiates joy when she feeds it. And the joy of the specific hare depends on whether Inna fed its adjacent hares before feeding it. Inna knows how much joy a hare radiates if it eats when either both of his adjacent hares are hungry, or one of the adjacent hares is full (that is, has been fed), or both of the adjacent hares are full. Please note that hares number 1 and *n* don't have a left and a right-adjacent hare correspondingly, so they can never have two full adjacent hares.

Help Inna maximize the total joy the hares radiate. :)

Input

The first line of the input contains integer *n* (1 ≤ *n* ≤ 3000) — the number of hares. Then three lines follow, each line has *n* integers. The first line contains integers *a*_{1} *a*_{2} ... *a*_{n}. The second line contains *b*_{1}, *b*_{2}, ..., *b*_{n}. The third line contains *c*_{1}, *c*_{2}, ..., *c*_{n}. The following limits are fulfilled: 0 ≤ *a*_{i}, *b*_{i}, *c*_{i} ≤ 10^{5}.

Number *a*_{i} in the first line shows the joy that hare number *i* gets if his adjacent hares are both hungry. Number *b*_{i} in the second line shows the joy that hare number *i* radiates if he has exactly one full adjacent hare. Number *с*_{i} in the third line shows the joy that hare number *i* radiates if both his adjacent hares are full.

Output

In a single line, print the maximum possible total joy of the hares Inna can get by feeding them.

Examples

Input

4

1 2 3 4

4 3 2 1

0 1 1 0

Output

13

Input

7

8 5 7 6 1 8 9

2 7 9 5 4 3 1

2 3 3 4 1 1 3

Output

44

Input

3

1 1 1

1 2 1

1 1 1

Output

4

Codeforces (c) Copyright 2010-2017 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: Nov/23/2017 00:55:39 (c2).

Desktop version, switch to mobile version.

User lists

Name |
---|