#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: 2096
	User: sucongyi
	Language: C++
	Result: Accepted
	Time:24 ms
	Memory:2072 kb
****************************************************************/