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