#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: chenmingyu
	Language: C++
	Result: Accepted
	Time:15 ms
	Memory:2072 kb
****************************************************************/