class Complex(object):
    def __init__(self, real, imaginary):
        self.real = real
        self.imaginary = imaginary
        
    def __add__(self, no):
        return Complex(self.real + no.real, self.imaginary + no.imaginary)
        
    def __sub__(self, no):
        return Complex(self.real - no.real, self.imaginary - no.imaginary)
        
    def __mul__(self, no):
        real = self.real * no.real - self.imaginary * no.imaginary
        imag = self.real * no.imaginary + self.imaginary * no.real
        return Complex(real, imag)

    def __truediv__(self, no):
        denominator = no.real ** 2 + no.imaginary ** 2
        real = (self.real * no.real + self.imaginary * no.imaginary) / denominator
        imag = (self.imaginary * no.real - self.real * no.imaginary) / denominator
        return Complex(real, imag)

    def mod(self):
        return Complex(math.sqrt(self.real ** 2 + self.imaginary ** 2), 0)