#include <bits/stdc++.h>
using namespace std;
int main(){
	int  n,y,t,s=0;
	cin>>n>>y;
	if((n%4==0&&n%100!=0)||n%400==0){
		s=1;
	}else{
		s=0;
	}
	if(y==2){
		if(s==1){
			cout<<29;
		}else{
			cout<<28;
		}
	}else if(y==4||y==6||y==9||y==11){
		cout<<30;
	}else{
		cout<<31;
	}
	
}


/**************************************************************
	Problem: 2096
	User: 15159808820
	Language: C++
	Result: Accepted
	Time:15 ms
	Memory:2072 kb
****************************************************************/