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#!/usr/bin/env python3
def main() -> None:
with open("input", "r", encoding="utf-8") as f:
data = list(map(int, f.read().split(",")))
# START PART 1
gauss_sum = lambda n: n
# END PART 1 START PART 2
gauss_sum = lambda n: n * (n + 1) // 2
# END PART 2
print(min(sum(gauss_sum(abs(i - n)) for n in data) for i in range(min(data), max(data) + 1)))
if __name__ == "__main__":
main()
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