Consider a sequence, which is formed by the following rule: next term is taken as the smallest possible non-negative integer, which is not yet in the sequence, so that `no 3` terms of sequence form an arithmetic progression.

## Example

`f(0) = 0` -- smallest non-negative  
`f(1) = 1` -- smallest non-negative, which is not yet in the sequence  
`f(2) = 3` -- since `0, 1, 2` form an arithmetic progression  
`f(3) = 4` -- neither of `0, 1, 4`, `0, 3, 4`, `1, 3, 4` form an arithmetic progression, so we can take smallest non-negative, which is larger than `3`  
`f(4) = 9` --  `5, 6, 7, 8` are not good, since `1, 3, 5`, `0, 3, 6`, `1, 4, 7`, `0, 4, 8` are all valid arithmetic progressions.  

etc...

## The task

Write a function `f(n)`, which returns the `n-th` member of sequence.

## Limitations

There are `1000` random tests with `0 <= n <= 10^9`, so you should consider algorithmic complexity of your solution.

```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 numpy as np\ndef sequence(n):\n    return ter2dec(dec2bin(n))\n    \ndef dec2bin(n):\n    bin = np.array([])\n    while n > 0:\n        bin = np.append(bin, [n%2])\n        n = n//2\n    return bin\n\ndef ter2dec(ter):\n    dec = 0\n    for i in range(len(ter)):\n        dec += ter[i]*3**i\n    return dec\n\n# Induction hypothesis:\n# Let S(n) be the sequence of numbers m that don't form arithmetic sequences, such that m < n.\n# For a given k, assume that all S(m) is precisely all the numbers m < k without 2's in their ternary form.\n# If m has at least one 2 in it's expansion there exist numbers in the sequence with the 2's repalced by 0's and the 2's replaced by 1's.\n#     This forms an arithmetic sequence.\n# If m has no 2's, consider A and B such that A,B,m is an arithmetic sequence and B is in S(m).\n# Comparing the rightmost digits of B and m which are different. A must have a 2 in this position to form an arithmetic sequence.\n#     Hence A is not in S(m) and m will be the next number in the sequence.\n# \n# Therefore the next number in the sequence has no 2's in it's ternary form.\n#\n# Base case: S(1) is 0, S(2) is 0,1.\n#\n# There is a trivial bijection between the nth numbers ternary form and the binary form of n.\n\n"
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'sequence'
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: 5554