def __add__(self , other):
    if self.deg != other.deg: return False
    else: return monome(self.coef + other.coef , self.deg)

def __sub__(self , other):
    if self.deg != other.deg: return False
    else: return monome(self.coef - other.coef , self.deg)

def __mul__(self , other):
    return monome(self.coef * other.coef , self.deg + other.deg)