Problem:
Score : 100 points

Problem Statement

Takahashi, who is A years old, is riding a Ferris wheel.

It costs B yen (B is an even number) to ride the Ferris wheel if you are 13 years old or older, but children between 6 and 12 years old (inclusive) can ride it for half the cost, and children who are 5 years old or younger are free of charge. (Yen is the currency of Japan.)

Find the cost of the Ferris wheel for Takahashi.

Constraints

0 ≤ A ≤ 100

2 ≤ B ≤ 1000

B is an even number.

Input

Input is given from Standard Input in the following format:

A B

Output

Print the cost of the Ferris wheel for Takahashi.

Sample Input 1

30 100

Sample Output 1

100

Takahashi is 30 years old now, and the cost of the Ferris wheel is 100 yen.

Sample Input 2

12 100

Sample Output 2

50

Takahashi is 12 years old, and the cost of the Ferris wheel is the half of 100 yen, that is, 50 yen.

Sample Input 3

0 100

Sample Output 3

0

Takahashi is 0 years old, and he can ride the Ferris wheel for free.

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Runtime Error)

import java.util.Scanner;

public class Main {

    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        String[] input = scanner.nextLine().split(" ");
        long gate_num = Long.valueOf(input[1]);

        long gate_min = Long.MIN_VALUE;
        long gate_max = Long.MAX_VALUE;

        for(int i = 0; i < gate_num; i++) {
            String[] allow_gate = scanner.nextLine().split(" ");
            long min = Long.valueOf(allow_gate[0]);
            long max = Long.valueOf(allow_gate[1]);

            if(min > gate_min) gate_min = min;
            if(max < gate_max) gate_max = max;
        }
        System.out.println(gate_max - gate_min + 1);
    }
}