class Calculator:
    def __init__(self):
        pass

    def add(self, a, b):
        return a + b

    def sub(self, a, b):
        return a - b

    def mul(self, a, b):
        return a * b

    def div(self, a, b):
        return a / b

    def exp(self, num1, num2):
        return num1 ** num2