from dataclasses import dataclass
from decimal import Decimal


@dataclass(frozen=True)
class Money:
    amount: Decimal

    def __post_init__(self):
        if self.amount.as_tuple().exponent < -2:
            raise ValueError(
                f"Money amount cannot have more than 2 decimal places: {self.amount}"
            )

    def __add__(self, other):
        return Money(self.amount + other.amount)

    def __sub__(self, other):
        return Money(self.amount - other.amount)