def Power_of_Two(n):

        if n%2 != 0 and n!=1:
            return False
        i=n
        while i >= 2:
            i = i/2

        return i == 1

print(Power_of_Two(1))
print(Power_of_Two(6))
print(Power_of_Two(16))
print(Power_of_Two(3))