# Task
John is an orchard worker. 

There are `n` piles of fruits waiting to be transported. Each pile of fruit has a corresponding weight. John's job is to combine the fruits into a pile and wait for the truck to take them away.

Every time, John can combine any two piles(`may be adjacent piles, or not`), and the energy he costs is equal to the weight of the two piles of fruit.

For example, if there are two piles, pile1's weight is `1` and pile2's weight is `2`. After merging, the new pile's weight is `3`, and he consumed 3 units of energy.

John wants to combine all the fruits into 1 pile with the least energy.

Your task is to help John, calculate the minimum energy he costs.

# Input

- `fruits`: An array of positive integers. Each element represents the weight of a pile of fruit.
  
  Javascript:
  - 1 <= fruits.length <= 10000
  - 1 <= fruits[i] <= 10000
  
  Python:
  - 1 <= len(fruits) <= 5000
  - 1 <= fruits[i] <= 10000

# Output

An integer. the minimum energy John costs.


# Examples

For `fruits = [1,2,9]`, the output should be `15`.

```
3 piles:  1  2  9
combine 1 and 2 to 3, cost 3 units of energy.
2 piles:  3  9
combine 3 and 9 to 12, cost 12 units of energy.
1 pile:  12

The total units of energy is 3 + 12 = 15 units
```

For `fruits = [100]`, the output should be `0`.

There's only 1 pile. So no need combine it.

```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 = 'import heapq\n\ndef comb(fruits):\n    heapq.heapify(fruits)\n    w = 0\n    while len(fruits) > 1:\n        x, y = heapq.heappop(fruits), heapq.heappop(fruits)\n        w += x + y\n        heapq.heappush(fruits, x + y)\n    return w\n'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'comb'
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: 5562