A regular box of cupcakes holds 8 cupcakes, while a small box holds 3 cupcakes. There are 28 students in a class and a total of at least 28 cupcakes. Your job is to determine how many cupcakes will be left over if each student gets one cupcake.</p>

입력 형식

The input consists of two lines.</p>

• The first line contains an integer R ≥ 0, representing the number of regular boxes.
• The second line contains an integer S ≥ 0, representing the number of small boxes.

Output the number of cupcakes that are left over.

예제 입력 1

2
5

예제 출력 1

3

예제 입력 2

2
4

예제 출력 2

0