class Power:
    def __init__(self, p=0):
        self.p = p

    def __iter__(self):
        self.n = 0
        return self

    def __next__(self):
        if self.n <= self.p:
            res = 2 ** self.n
            self.n += 1
            return res
        else:
            raise StopIteration


for i in Power(4):
    print(i)

# Coded by Saahil