Days in a Month

Problem Source

Luogu P5716

Problem Description

Given a year and a month, output how many days that month of that year has. Leap years must be taken into account.

Input Format

Two positive integers, representing the year $y$ and the month $m$, separated by a space.

Output Format

Output one line containing a positive integer: the number of days in that month.

Sample Input 1

1926 8

Sample Output 1

31

Sample Input 2

2000 2

Sample Output 2

29

Hint

• Days fall into three tiers: "big months" have $31$ days, "small months" have $30$ days, and February is special. What else does February's day count depend on? You just practised this.
• There are many branches; you can use switch, or combine months of the same tier with || conditions — pick whichever is convenient.
• Verify with the samples: 2000 2 → 29.

The data guarantees $1583 \leq y \leq 2020$ and $1 \leq m \leq 12$.