#include <bits/stdc++.h> 
using namespace std;
int main(){
    int n,y,r,s=0;
    cin>>n>>y;
    if(n%4==0&&n%100!=0||n%400==0){
        if(y==2){
            cout<<29;
        }else{
            if(y==1||y==3||y==5||y==7||y==8||y==10||y==12){
                cout<<31;
            }else{
                cout<<30; 
            }
        }
    }else{
        if(y==2){
            cout<<28;
        }else{
            if(y==1||y==3||y==5||y==7||y==8||y==10||y==12){
                cout<<31;
            }else{
                cout<<30; 
            }
        }   
    }
}
/**************************************************************
	Problem: 1867
	User: sucongyi
	Language: C++
	Result: Accepted
	Time:90 ms
	Memory:2072 kb
****************************************************************/