Please read entire prompt and example cases clearly! java

Input

Each test begins with two integers: 1

Output

The number of walkover matches.

O If both players are available, then there will be a normal match. If only one player is available, then this is a walkover match and the player automatically advances to the next level. If no player is available, then there is no match. . In the figure on the right, the players 3 and 4 could not arrive. Their match is canceled. Players 1 and 2, play their regular match and the winner advances to the next level match. But there is no second player there, so it is a walkover match. Given the list of players who could not arrive on time, calculate the number of the walkover matches in the whole championship. Input Each test begins with two integers: 1