Imperfect Numbers

Chef calls a **positive** integer *imperfect* if it's divisible by **either** $2$ or $5$, but **not both**. For example, $8$ and $15$ are *imperfect* integers, while $20$ is not. You are given an integer $N$. Find the **minimum** possible difference between $N$ and an *imperfect* number. That is, find the minimum possible value of $|N - M|$ across all choices of $M$ that are *imperfect* numbe