Help for problem PPNUM

@hatim009 >> You could have started a new thread for your doubt.
https://code.google.com/codejam/contest/189252/dashboard#s=a&a=2 It was a GCJ 2009 question.

okā€¦but I had seen kurumaā€™s submission thatā€™s why I asked him hereā€¦Thanks