import decimal
from fractions import Fraction as Frac

class Dec(decimal.Decimal):
    def __new__(cls,value="0",context=None):
        if isinstance(value, Frac):
            return super().__new__(cls,value.numerator,context) / super().__new__(cls,value.denominator,context)
        else:
            return super().__new__(cls,value,context)

    getcontext = decimal.getcontext