A511.某年某月

#include<iostream>
using namespace std;
int main(){
	int y,m;
	cin>>y>>m;
	switch(m){
		case 2:
			if(y%4==0&&y%100||y%400==0) cout<<29;
			else cout<<28;
            break;
		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;
	}
	return 0; 
}