Sum of N

Define $f(X)$ as the largest [divisor](https://en.wikipedia.org/wiki/Divisor) of $X$ other than $X$ itself. For example, $f(12) = 6$ and $f(7) = 1$. Note that $f(1)$ is defined to be $0$. Given an integer $K$, find the **sum** of all $N$ such that $f(N) = K$. It can be shown that the answer does not exceed $10^{18}$ under the given constraints. ### Input - The first line of input will contai