URI Online Judge | 1933


By Ricardo Anido, Universidade Estadual de Campinas BR Brazil

Timelimit: 1

Tri-du is a card game inspired in the popular game of Truco. The game uses a normal deck of 52 cards, with 13 cards of each suit, but suits are ignored. What is used is the value of the cards, considered as integers between 1 to 13.

In the game, each player gets three cards. The rules are simple:

Note that the game may not have a winner in many situations; in those cases, the cards are returned to the deck, which is re-shuffled and a new game starts.

A player received already two of the three cards, and knows their values. Your task is to write a program to determine the value of the third card that maximizes the probability of that player winning the game.


The input consists of a single line, which contains two integers A (1 ≤ A ≤ 13) and B (1 ≤ B ≤ 13) that indicates the value of the two first received cards.


Your program must produce a single line, containing exactly one integer, representing the value of the card that maximizes the probability of the player winning the game.

Input Example Output Example

10 7


2 2