# Author: Team #13
# Date: 1/27/23

# Note by Scott: this seems to have an infinite loop!
# Can you find and fix the bug?

start_power = 0
power = int(input("Enter a number: "))
answer = 0
while start_power <= power:
    answer = 2**start_power
    if answer < power:
        print("2^", start_power, ":", 2**(start_power), sep = "")
        start_power = start_power + 1