How to take big value as input?

I used unsigned long long int. But it didn’t help.

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How big is the number? Provide an example.

Since you haven’t specifies the language you are using… There are multiple ways to handle large values:

  1. Use Python
  2. Use Java’s BigInteger class.
  3. Use Custom BIginteger class in cpp
    https://github.com/williamchanrico/biginteger-cpp/blob/master/BigInt.cpp
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