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# Power digit sum
# Problem 16
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# 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?
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const NUMBER = big(2) ^  1000

result = sum(parse(Int, digit) for digit in string(NUMBER))

println(result)