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because lcm(b)~1.77*10^19, which is out of integer range, even long long range. So integer overflow happens (https://en.wikipedia.org/wiki/Integer_overflow) // integer range is from -2^31 to 2^31-1~2.15*10^9, long long range is from -2^61 to 2^61-1~3.21*10^18.
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because lcm(b)~1.77*10^19, which is out of integer range, even long long range. So integer overflow happens (https://en.wikipedia.org/wiki/Integer_overflow) // integer range is from -2^31 to 2^31-1~2.15*10^9, long long range is from -2^61 to 2^61-1~3.21*10^18.