class complexy(object):
  def __init__(self, x,y):
    self.re=float(x)
    self.im=float(y)
  def __add__(self,other):
    if isinstance(other,(int,float)):
      return complexy(self.re+float(other),self.im)
    elif isinstance(other,complexy):
      return complexy(self.re+other.re,self.im+float(other.im))
  def __mul__ (self,other):
    if isinstance(other,(int,float)):
      return complexy(self.re*float(other),self.im*float(other))
    elif isinstance(other,complexy):
      R=self.re*other.re-self.im*other.im
      I=self.re*other.im+self.im*other.re
      return complexy(R,I)
  def __repr__(self):
    sign='+'if self.im>0 else'-'
    s=str(self.re)+sign+str(abs(self.im))+'i'
    return s
a=complexy(1,2)
b=complexy(3,4)
print a*b