Plagiarism

You are an administrator of a popular quiz website. Every day, you hold a quiz on the website. There are $N$ users (numbered $1$ through $N$) and $M$ admins (numbered $N+1$ through $N+M$). For each quiz, each user is allowed to attempt it at most once. Sometimes, admins attempt the quizzes for testing purposes too; an admin may attempt a quiz any number of times. On a certain day, the quiz w