class FuzzySet:
    def __init__(self, name: str, a: float, b: float, c: float, d: float):
        self.name = name
        self.a = a
        self.b = b
        self.c = c
        self.d = d

    def affiliation(self, x: float) -> float:
        if x <= self.a or x >= self.d:
            return 0
        if self.b <= x <= self.c:
            return 1

        if x <= self.b:
            return (x - self.a) / (self.b - self.a)
        else:
            return (self.d - x) / (self.d - self.c)

    def defuzzification(self) -> float:
        return (self.c + self.b) / 2