Even sum

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FInd the sum of even natural numbers upto $n$. ###Input: The first line will contain a single integer i.e. the value of $n$. ###Output: Output a single line, the sum even natural numbers upto $n$. ###Constraints - $1 \leq n \leq 1000$ ###Sample Input: 10 ###Sample Output: 30

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solution.cppC++17

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