Problem Description

Given a year and a month, output the number of days in that month of that year. Consider leap years.

Input Format

Input consists of two positive integers, representing the year \( y \) and the month \( m \), separated by a space.

Output Format

Output a single positive integer, representing the number of days in that month.

Sample Input and Output

Input Sample #1

1926 8

Output Sample #1

31

Input Sample #2

2000 2

Output Sample #2

29

Notes

The data guarantees that \( 1583 \leq y \leq 2020 \) and \( 1 \leq m \leq 12 \).

见题面 Input 部分

见题面 Output 部分