# Task

John won the championship of a TV show. He can get some bonuses.

He needs to play a game to determine the amount of his bonus.

Here are some cards in a row. A number is written on each card.

In each turn, John can take a card, but only from the beginning or the end of the row. Then multiply the number on the card by an coefficient 2^(i)(i means the ith turn). The product is John's bonus of current turn.

After all the cards are taken away, the game is over. John's final bonus is the sum of all rounds of bonuses.

Obviously, the order in which John takes the cards will affect the amount of John's final bonus.

Your task is to help John calculate the maximum amount of bonuses he can get.

# Input

- `cards`: An integer array. Each element represents the number on the card.
  - `1 <= cards.length <= 30`
  - `1 <= cards[i] <= 100`


- All inputs are valid.

# Output

An integer. the maximum amount of bonuses John can get.

# Eaxmple

For `cards=[1,2,5]`, the output should be `50`.

```
All possible orders are:
1->2->5   bonus:1x2+2*4+5*8=50
1->5->2   bonus:1x2+5*4+2*8=38
5->1->2   bonus:5*2+1*4+2*8=30
5->2->1   bonus:5*2+2*4+1*8=26
The maximum amount of bonus is 50.
```

```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

def _disabled_input(*args, **kwargs):
    raise RuntimeError("input() is disabled in callable mode")
builtins.input = _disabled_input

ns = {"__name__": "__judge__"}  # prevent if __name__ == "__main__" blocks
for _k, _v in list(globals().items()):
    if not _k.startswith("_"):
        ns[_k] = _v
_CODE = 'def calc(a):\n    res = [0] * (len(a) + 1)\n    for k in range(len(a)):\n        res = [2 * max(a[i] + res[i+1], a[i+k] + res[i]) for i in range(len(a) - k)]\n    return res[0]'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'calc'
if _fn_name:
    if "Solution" in ns:
        try:
            _obj = ns["Solution"]()
            if hasattr(_obj, _fn_name):
                _target = getattr(_obj, _fn_name)
        except Exception:
            _target = None
    if _target is None and _fn_name in ns and callable(ns[_fn_name]):
        _target = ns[_fn_name]
# Fallback: if there's exactly one user-defined function, use it
if _target is None:
    _cands = [v for k, v in ns.items() if callable(v) and getattr(v, "__module__", "") in ("__judge__", "__main__")]
    _user_funcs = [c for c in _cands if getattr(c, "__name__", "").startswith("_") is False]
    if len(_user_funcs) == 1:
        _target = _user_funcs[0]
if _target is None:
    raise RuntimeError(f"Could not resolve callable '{_fn_name}'")

_raw = sys.stdin.read().strip()
if _raw:
    _parsed = json.loads(_raw)
    if isinstance(_parsed, dict):
        _kwargs = _parsed.get("kwargs", {})
        _args = _parsed.get("args", [])
    else:
        _args, _kwargs = _parsed, {}
else:
    _args, _kwargs = [], {}
if not isinstance(_args, (list, tuple)):
    _args = [_args]
_res = _target(*_args, **_kwargs)
try:
    sys.stdout.write(repr(_res) + "\n")
except Exception:
    pass

```

Measured memory_bytes: 5894