I've been trying to solve this problem — 385C - Медведь и простые числа , Bear and Prime Numbers. My solution gives a completely expected runtime error on Testcase#4. Can someone please explain to me as to why this is happening?

My solution: http://mirror.codeforces.com/contest/385/submission/12629174

Any help would be greatly appreciated.

Thanks in advance.

EDIT: Solved. I had not taken into consideration that even l could be greater than 10000000.