文件目录

#include <iostream>
using namespace std;
int main()
{
    int y, d;
    cin >> y >> d;
    switch (d)
    {
    case 1:
    case 3:
    case 5:
    case 7:
    case 8:
    case 10:
    case 12:
        cout << 31;
        break;
    case 4:
    case 6:
    case 9:
    case 11:
        cout << 30;
        break;
    default:
        if (y % 4 == 0 && y % 100 != 0 || y % 400 == 0)
            cout << 29;
        else
            cout << 28;
    }
    return 0;
}