Once again, we have a lot of requests from coders for a challenging problem on geometry. Geometry expert Nitin is thinking about a problem with parabolas, icosahedrons, crescents and trapezoids, but for now, to encourage beginners, he chooses to work with circles and rectangles.
You are given two sequences $A_1, A_2, \ldots, A_N$ and $B_1, B_2, \ldots, B_N$. You should choose a permutation $P_1, P_2, \ldots, P_N$ of the integers $1$ through $N$ and construct $N$ rectangles with dimensions $A_1 \times B_{P_1}, A_2 \times B_{P_2}, \ldots, A_N \times B_{P_N}$. Then, for each of these rectangles, you should construct an inscribed circle, i.e. a circle with the maximum possible area that is completely contained in that rectangle.
Let $S$ be the sum of diameters of these $N$ circles. Your task is to find the maximum value of $S$.

-----Input-----
- The first line of the input contains a single integer $T$ denoting the number of test cases. The description of $T$ test cases follows.
- The first line of each test case contains a single integer $N$.
- The second line contains $N$ space-separated integers $A_1, A_2, \ldots, A_N$. 
- The third line contains $N$ space-separated integers $B_1, B_2, \ldots, B_N$. 

-----Output-----
For each test case, print a single line containing one integer ― the maximum value of $S$. It is guaranteed that this value is always an integer.

-----Constraints-----
- $1 \le T \le 50$
- $1 \le N \le 10^4$
- $1 \le A_i, B_i \le 10^9$ for each valid $i$

-----Subtasks-----
Subtask #1 (20 points):
- $A_1 = A_2 = \ldots = A_N$
- $B_1 = B_2 = \ldots = B_N$
Subtask #2 (80 points): original constraints

-----Example Input-----
2
4
8 8 10 12
15 20 3 5
3
20 20 20
10 10 10

-----Example Output-----
30
30

-----Explanation-----
Example case 1: Four rectangles with dimensions $8 \times 3$, $8 \times 5$, $10 \times 20$ and $12 \times 15$ lead to an optimal answer.

```python

USER_FILENAME = "<user_code>"
import sys, json, builtins
import math, heapq, bisect, itertools, functools, collections, statistics, fractions, decimal, operator, array, random, re, string, os, pathlib
try:
    import resource as _res
except Exception:
    _res = None
from collections import Counter, defaultdict, deque, OrderedDict
from functools import lru_cache, reduce
from itertools import accumulate, permutations, combinations, product
from math import gcd, ceil, floor, sqrt
from decimal import Decimal
try:
    from typing import *
except Exception:
    pass
try:
    sys.setrecursionlimit(1_000_000)
except Exception:
    pass
try:
    import site as _site
    try:
        _sys_sites = _site.getsitepackages() if hasattr(_site, "getsitepackages") else []
        for _p in _sys_sites:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
    try:
        _usp = _site.getusersitepackages()
        if isinstance(_usp, str):
            _usp = [_usp]
        for _p in _usp:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
except Exception:
    pass

ns = {"__name__": "__main__"}
for _k, _v in list(globals().items()):
    if not _k.startswith("_"):
        ns[_k] = _v
_CODE = 'import itertools\nt=int(input())\nfor i in range(t):\n n=int(input())\n a=list(map(int,input().split()))\n a.sort()\n b=list(map(int,input().split()))\n b.sort()\n s=0\n for (f,g) in zip(a,b):\n  s+=min(f,g)\n print(s)'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

```

Measured memory_bytes: 13211