from dataclasses import dataclass
from typing import Self


@dataclass
class Foo:
    a: int
    b: int

    def print(self: Self) -> None:
        print(self.a, self.b)

    def max(self: Self) -> int:
        return max(self.a, self.b)

    def sum(self: Self) -> int:
        return self.a + self.b

    def change_vals(self: Self, a: int, b: int) -> None:
        self.a = a
        self.b = b