Factorial fun!!

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Biyani loves maths!. Today he decided to study a new topic known as double factorial of a number.Double factorial of a number $N$ is product of all numbers from $1$ to $N$ having same parity as $N$ and less than or equal to $N$ . It is denoted by $N!!$.for example, let $N$ is equal to $6$ then double factorial of $n$ is $6*4*2$ that is $48$. Biyani wonders how many distinct prime divisors of $N

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solution.cppC++17

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