diff --git a/main.py b/main.py
new file mode 100644
index 0000000..306d454
--- /dev/null
+++ b/main.py
@@ -0,0 +1,102 @@
+import datetime
+from random import randint
+from typing import Tuple, NamedTuple, Union, Iterable
+
+START_LEGACY_DATE: datetime.date = datetime.date(1800, 1, 1)
+FINAL_LEGACY_DATE: datetime.date = datetime.date(2017, 7, 1)
+
+
+class PersonalCode(NamedTuple):
+    first_part: str
+    second_part: str
+    has_check_digit: bool = False
+
+    @classmethod
+    def generate_anonymous_personal_code(cls) -> "PersonalCode":
+        pc = f"3{randint(2 * 10 ** 9, 10 * 10 ** 9 - 1)}"
+        first_part = pc[:6]
+        second_part = pc[6:]
+        instance = cls(first_part, second_part)
+        return instance
+
+    @classmethod
+    def generate_anonymous_with_check_digit(cls) -> "PersonalCode":
+        tmp = cls.generate_anonymous_personal_code()
+        check_digit = tmp._get_checksum_digit()
+        if check_digit == 10:
+            return tmp.generate_anonymous_with_check_digit()
+        second_part = tmp.second_part[:-1]+str(check_digit)
+        instance = cls(tmp.first_part, second_part, True)
+        return instance
+
+    @classmethod
+    def generate_legacy_with_check_digit(cls, years: int = None) -> "PersonalCode":
+        if years is not None:
+            if years < (datetime.date.today()-FINAL_LEGACY_DATE).days//365:
+                raise ValueError(
+                    f"Too young for legacy Personal Code! years < {(datetime.date.today()-FINAL_LEGACY_DATE).days//365}"
+                )
+            min_age_in_days = abs(years)*365
+            max_age_in_days = abs(years+1)*365
+            birthdate = datetime.date.today() - datetime.timedelta(days=randint(min_age_in_days, max_age_in_days))
+        else:
+            max_age_in_days = (FINAL_LEGACY_DATE-START_LEGACY_DATE).days
+            min_age_in_days = 1
+            birthdate = FINAL_LEGACY_DATE - datetime.timedelta(days=randint(min_age_in_days, max_age_in_days))
+        first_part = f"{birthdate.day:02d}{birthdate.month:02d}{str(birthdate.year)[2:]}"
+        century_digit = 2 if birthdate.year // 2000 else 1 if birthdate.year // 1900 else 0
+        second_part = f"{century_digit}{randint(0, 999):03}"
+        tmp = cls(first_part, second_part)
+        check_digit = tmp._get_checksum_digit()
+        if check_digit == 10:
+            return cls.generate_legacy_with_check_digit()
+        second_part = f"{second_part}{check_digit}"
+        return cls(first_part, second_part, True)
+
+    @classmethod
+    def generate_legacy_for_birthday(cls, *args: Union[Union[datetime.date], Union[int, int, int]]) -> "PersonalCode":
+        if len(args) == 1:
+            if not isinstance(args[0], datetime.date):
+                raise ValueError(
+                    f"Calling method with one parameter, it must be of type `datetime.date` not `{type(args[0])}`"
+                )
+            birthday = args[0]
+        elif len(args) == 3:
+            if not all(isinstance(o, int) for o in args):
+                raise ValueError(
+                    f"Calling method with three parameters, they all must be of type `int` not `{[type(arg) for arg in args]}`"
+                )
+            birthday = datetime.date(*args)
+        else:
+            raise ValueError(
+                "Method must be called with either one argument which is `datetime.date` or three int parameters "
+                f"which represent year, month, day representing date between {START_LEGACY_DATE} and {FINAL_LEGACY_DATE}"
+            )
+        if not START_LEGACY_DATE <= birthday < FINAL_LEGACY_DATE:
+            raise ValueError(
+                f"Legacy non-anonymous personal codes are generated for birthdays since {START_LEGACY_DATE} till {FINAL_LEGACY_DATE}!\n"
+                f"{START_LEGACY_DATE} <= {birthday} < {FINAL_LEGACY_DATE}"
+            )
+        first_part = f"{birthday.day:02d}{birthday.month:02d}{str(birthday.year)[2:]}"
+        century_digit = 2 if birthday.year // 2000 else 1 if birthday.year // 1900 else 0
+        second_part = f"{century_digit}{randint(0, 999):03}"
+        tmp = cls(first_part, second_part)
+        check_digit = tmp._get_checksum_digit()
+        if check_digit == 10:
+            return cls.generate_legacy_with_check_digit()
+        second_part = f"{second_part}{check_digit}"
+        return cls(first_part, second_part, True)
+
+    def as_tuple(self) -> Tuple[str, str]:
+        return self.first_part, self.second_part
+
+    def __str__(self):
+        return f"{self.first_part}{self.second_part}"
+
+    def _get_checksum_digit(self) -> int:
+        _factors = [1, 6, 3, 7, 9, 10, 5, 8, 4, 2]
+        return (1101 - sum(map(lambda p, f: int(p) * f, str(self)[:10], _factors))) % 11
+
+    @property
+    def dashed(self):
+        return f"{self.first_part}-{self.second_part}"
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