Given a year Y and a month M, return how many days there are in that month. Example 1: Input: Y = 1992, M = 7 Output: 31 Example 2: Input: Y = 2000, M = 2 Output: 29 Example 3: Input: Y = 1900, M = 2 Output: 28 Note: 1583 <= Y <= 2100 1 <= M <= 12