codeforce wonderful platform feature show contribute community every register user contribution integer number necessarily positive there n register user ith contribution tilimak little polar bear he s new competitive programming he do not account Codeforces able upvote exist blog comment we assume register user infinitely blogs comment Limak spend b minute read blog upvote Authors contribution increase 5 Limak spend c minute read comment upvote Authors contribution increase 1 note possible Limak read blog fast commentslimak like tie he think awesome tie k register user to happen go spend time read upvote after exist integer value x k register user contribution exactly xHow time Limak need achieve goal