# Task
 You are given an array of integers. Your task is to determine the minimum number of its elements that need to be changed so that elements of the array will form an arithmetic progression. Note that if you swap two elements, you're changing both of them, for the purpose of this kata.

 Here an arithmetic progression is defined as a sequence of integers such that the difference between consecutive terms is constant. For example, `6 4 2 0 -2` and `3 3 3 3 3` are arithmetic progressions, but `0 0.5 1 1.5` and `1 -1 1 -1 1` are not.

# Examples

  For `arr = [1, 3, 0, 7, 9]` the answer is `1` 
  
  Because only one element has to be changed in order to create an arithmetic progression.
    
  For `arr = [1, 10, 2, 12, 3, 14, 4, 16, 5]` the answer is `5` 
 
  The array will be changed into `[9, 10, 11, 12, 13, 14, 15, 16, 17]`.

# Input/Output


 - `[input]` integer array `arr`

  An array of N integers.
  
  `2 ≤ arr.length ≤ 100`
  
  `-1000 ≤ arr[i] ≤ 1000`

  Note for Java users: you'll have a batch of 100 bigger random arrays, with lengths as `150 ≤ arr.length ≤ 300`.
  

 - `[output]` an integer

  The minimum number of elements to change.

```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 itertools import combinations\n\ndef fix_progression(arr):\n    ans = len(arr) - 1\n    for l, r in combinations(range(len(arr)), 2):\n        step = (arr[r] - arr[l]) / (r - l)\n        if step.is_integer():\n            step = int(step)\n            changed = sum(a != i for i, a in zip(range(arr[l]-step*l, 10**10*step, step), arr)) if step else sum(a != arr[l] for a in arr)\n            ans = min(ans, changed)\n    return ans'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'fix_progression'
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: 6412