Just another day in the world of Minecraft, Steve is getting ready to start his next exciting project -- building a railway system!

![Alt text](http://static.planetminecraft.com/files/resource_media/screenshot/1506/2015-02-02_0156508603066.jpg)

But first, Steve needs to melt some iron ores in the furnace to get the main building blocks of rails -- iron ingots. ![Alt text](http://www.blocksandgold.com/media/catalog/product/cache/3/image/35x/cbcbef48e5e3bcce7c7ed908f20bc5b4/i/r/ironingot_icon32.png)

Each iron ingot takes 11 seconds* to produce. Steve needs a lot of them, and he has the following fuel options to add into the furnace: 

* Buckets of lava, each lasts 800 seconds* ![Alt text](http://www.minecraftguides.org/images/items/bucketL.gif)
* Blaze rod, each lasts 120 seconds ![Alt text](http://www.minecraftguides.org/images/items/blazerod.gif)
* Coals, each lasts 80 seconds ![Alt text](http://www.minecraftguides.org/images/items/coal.gif)
* Blocks of Wood, each lasts 15 seconds ![Alt text](http://www.minecraftguides.org/images/itemGifs/logs.gif)
* Sticks, each lasts 1 second* ![Alt text](http://www.minecraftguides.org/images/items/stick.gif)

In Ruby: 
Write a function `calc_fuel` that calculates the **minimum** amount of fuel needed to produce a certain number of iron ingots. This function should return a hash of the form `{:lava => 2, :blaze_rod => 1, :coal => 1, :wood => 0, :stick => 0}`
In JavaScript:
Write a function `calcFuel` that calculates the **minimum** amount of fuel needed to produce a certain number of iron ingots. This function should return an object of the form `{lava: 2, blazeRod: 1, coal: 1, wood: 0, stick: 0}`
In Python:
Write a function `calc_fuel` that calculates the **minimum** amount of fuel needed to produce a certain number of iron ingots. This function should return a dictionary of the form `{"lava": 2, "blaze rod": 1, "coal": 1, "wood": 0, "stick": 0}`

---
*fictional values

To all the Minecraft players out there: 
feel free to expand this series or let me know if you have any ideas related to Minecraft that can be turned into codewars puzzles. Some ideas I have that might potentially be turned into katas:

* distance traveled in real world vs. in Nether
* shortest path problems related to mining diamonds/gold/goodies that appears in different levels under ground
* growth of animal population from breeding
* redstone stuff?!

If you do end up expanding this series, please send me a link of your kata so I can check it out and include a link to your kata here :-)

* [Minecraft Series #1: Steve wants to build a beacon pyramid](https://www.codewars.com/kata/minecraft-series-number-1-steve-wants-to-build-a-beacon-pyramid/ruby)
* [Minecraft Series #3: Lava is amazing! ](https://www.codewars.com/kata/583a23d40cf946ec380002c2)
* [Minecraft Series #4: Lava is amazing, however...](https://www.codewars.com/kata/583a6b0b171f3a3c3f0003e3)

```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_fuel(n):\n    n *= 11\n    values = {'lava': 800, 'blaze rod': 120, 'coal': 80, 'wood': 15, 'stick': 1}\n    usage = {'lava': 0, 'blaze rod': 0, 'coal': 0, 'wood': 0, 'stick': 0}\n    \n    for fuel_source, duration in list(values.items()):\n        if n // duration > 0:\n            usage[fuel_source] = n // duration\n            n -= n // duration * duration\n    \n    return usage\n"
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'calc_fuel'
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: 6034