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class Rational:
    @staticmethod
    def gcd(a, b):
        while (b != 0):
            (a, b)=(b, a%b)
        return a

    @staticmethod
    def sgn(x):
        if x > 0:
            return 1
        elif x < 0:
            return -1
        else: return 0

    def __init__(self, n, d):
        if n == 0:
            self.num=0
            self.den = 1
        else:
            z = self.sgn(n)*self.sgn(d)
            n = abs(n)
            d = abs(d)
            k = self.gcd(n,d)
            self.num = z*n//k
            self.den = d//k

    def __str__(self):
        if self.num == 0:
            return "0"
        else:
            return str(self.num)+"/"+str(self.den)

    def __add__(self, o):
        n1=self.num
        d1=self.den
        if type(o)==int:
            n2=o
            d2=1
        else:
            n2=o.num
            d2=o.den
        n= n1*d2+n2*d1
        d=d1*d2
        return Rational(n, d)

    def __radd__(self, o):
        n1=self.num
        d1=self.den
        if type(o)==int:
            n2=o
            d2=1
        else:
            n2=o.num
            d2=o.den
        n= n1*d2+n2*d1
        d=d1*d2
        return Rational(n, d)

    def __sub__(self, o):
        n1=self.num
        d1=self.den
        n2=o.num
        d2=o.den
        n= n1*d2-n2*d1
        d=d1*d2
        return Rational(n, d)

    def __mul__(self, o):
        n1=self.num
        d1=self.den
        n2=o.num
        d2=o.den
        n= n1*n2
        d=d1*d2
        return Rational(n, d)

    def __floordiv__(self, o):
        n1=self.num
        d1=self.den
        n2=o.num
        d2=o.den
        n= n1*d2
        d=n2*d1
        return Rational(n, d)

d1 = Rational(1, 2)
d2 = Rational(1, 3)
d3=d1+d2
print(d3)
d4 = d1-d2
print(d4)
d5=d1*d2
print(d5)
d6=d1*d2
print(d6)
d7 = d1//d2
print(d7)
d8 = 6+d1
print(d8)