Buddy and interview

Buddy has recently got an interview call from his dream company. However, to crack the interview, he needs to answer a few queries. For each query, the interviewer will ask him the $specialvalue$ corresponding to a positive integer. The special value of an integer $N$ denoted by $specialvalue(N)$ is defined as: $specialvalue(N) = specialvalue(∏(Di-1))+1$ $for$ $N > 1$ where $Di$ is the i-th dis