#include<iostream>
using namespace std;
int main(){
    int a,b;
	cin>>a>>b;
	if(a%100==0&&(a%400==0)||(a%100!=0&&(a%4==0))||(b==2))
	cout<<"29"<<endl;
	else if ((b==1)||(b=3)||(b=5)||(b==7)||(b==8)||(b==10)||(b==12))
	cout<<"31"<<endl;
	else if ((b==4)||(b==6)||(b==9)||(b==11))
	cout<<"30"<<endl;
	else cout<<"28"<<endl;
	return 0;
}