"""
2^15 = 32768 and the sum of its digits is 3 + 2 + 7 + 6 + 8 = 26.

What is the sum of the digits of the number 2^1000 ?
"""


def power_digit_sum(n):
    return sum(int(digit) for digit in str(2**n))


def main():
    print(power_digit_sum(1000))


if __name__ == "__main__":
    main()