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




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