#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,m,s=0;
	cin>>n>>m;
	if(m==1||m==3||m==5||m==7||m==8||m==10||m==12){
		cout<<"31";
	}else{
		if(m==4||m==6||m==9||m==11){
			cout<<"30";
		}else{
			if(m%100!=0&&m%4==0||m%400==0){
				cout<<"29";
			}else{
				cout<<"28";
			}
		}
	}
	return 0;
}