A [Power Law](https://en.wikipedia.org/wiki/Power_law) distribution occurs whenever "a relative change in one quantity results in a proportional relative change in the other quantity." For example, if *y* = 120 when *x* = 1 and *y* = 60 when *x* = 2 (i.e. *y* halves whenever *x* doubles) then when *x* = 4, *y* = 30 and when *x* = 8, *y* = 15.


Therefore, if I give you any pair of co-ordinates (x1,y1) and (x2,y2) in a power law distribution, you can plot the entire rest of the distribution and tell me the value of *y* for any other value of *x*. 

Given a pair of co-ordinates (x1,y1) and (x2,y2) and another x co-ordinate *x3*, return the value of *y3*

```
powerLaw(x1y1, x2y2, x3)
e.g. powerLaw([1,120], [2,60], 4)
- when x = 1, y = 120
- when x = 2, y = 60
- therefore whenever x doubles, y halves
- therefore when x = 4, y = 60 * 0.5
- therfore solution = 30
```

(x1,y1) and (x2,y2) will be given as arrays. Answer should be to the nearest integer, but random tests will give you leeway of 1% of the reference solution to account for possible discrepancies from different methods.

```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 = 'from math import log\n\ndef power_law(x1y1, x2y2, x3):\n    (x1, y1), (x2, y2) = (x1y1, x2y2)\n    try:\n        k = log(y1 / y2, x1 / x2)\n        a = y1 / x1 ** k\n        return round(a * x3 ** k)\n    except ZeroDivisionError:\n        return y2'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'power_law'
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: 5608