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

就行