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