Scheduling is how the processor decides which jobs(processes) get to use the processor and for how long. This can cause a lot of problems. Like a really long process taking the entire CPU and freezing all the other processes. One solution is Shortest Job First(SJF), which today you will be implementing.

SJF works by, well, letting the shortest jobs take the CPU first. If the jobs are the same size then it is First In First Out (FIFO). The idea is that the shorter jobs will finish quicker, so theoretically jobs won't get frozen because of large jobs. (In practice they're frozen because of small jobs).

You will be implementing:
```python
  def SJF(jobs, index)
```

It takes in:

1. "jobs" a non-empty array of positive integers. They represent the clock-cycles(cc) needed to finish the job.
2. "index" a positive integer. That represents the job we're interested in.

SJF returns:

1. A positive integer representing the cc it takes to complete the job at index.

Here's an example:
```
SJF([3, 10, 20, 1, 2], 0)
at 0cc [3, 10, 20, 1, 2] jobs[3] starts
at 1cc [3, 10, 20, 0, 2] jobs[3] finishes, jobs[4] starts
at 3cc [3, 10, 20, 0, 0] jobs[4] finishes, jobs[0] starts
at 6cc [0, 10, 20, 0, 0] jobs[0] finishes
```

so:
```
SJF([3,10,20,1,2], 0) == 6
```

```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 SJF(jobs, index):\n    return sum(j for i, j in enumerate(jobs)\n                 if j < jobs[index] or (j == jobs[index] and i <= index))\n'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'SJF'
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: 5770