2014 Mock CCC by Alex and Timothy

Alice has a crush on her friend Bob, but she is too shy to express it. From an ancient recipe passed down through her family, she has concocted a vial of love potion. She plans to slip this potion into Bob's food every day so he will love her forever. The only problem is that the potion is so potent, taking too much can make Bob overdose, resulting in him being utterly indifferent towards her.

According to a note on the recipe, if some amount of the potion is ingested one day, only ~50\%~ of that amount is retained in the body on the next day, and ~0\%~ of that amount is retained on the day after that. You are given ~A~ and ~B~, the amount of love potion in mL that Alice gives to Bob on the first and second day, respectively, and ~R~, the recommended dosage in mL, according to her recipe. Write a program to determine whether Bob overdoses on the first day, the second day, or neither. Note that if Bob overdoses on the first day, he cannot overdose again on the second.

Input Specification

Three lines, containing the three non-negative integers ~A~, ~B~, and ~R~, each no greater than ~1000~.

Output Specification

If he overdoses on the first day, output Bob overdoses on day 1. If he overdoses on the second day, output Bob overdoses on day 2. Otherwise, output Bob never overdoses.

Sample Input 1

100
200
249

Sample Output 1

Bob overdoses on day 2.

Sample Input 2

50
100
125

Sample Output 2

Bob never overdoses.

Explanation

For the first example, Alice slips Bob ~100~ mL of the potion on day one, of which, only ~50~ mL remain in Bob's body on day two. ~50~ mL is added on top of the ~200~ mL that he ingests on day two to make ~250~ mL, which is barely enough to make him overdose the recommended dosage of ~249~ mL.

For the second example, the amount from day one reduces to ~25~ mL on day two, when he is given another ~100~ mL to yield a total of ~125~ mL for the second day. ~125~ mL happens to be just the right dosage, so he does not overdose.