我叫陈德唧

#include <bits/stdc++.h>
using namespace std;

int main()
{
	int m,y;
	cin>>m>>y;
	if(y==2)
	{
		if(m%4==0 and m%100!=0 or m%400==0)
		{
			cout<<"29";
			return 0;
		}
		else 
		{
			cout<<"28";
			return 0;
		}
	}
	else if(y==1 or y==3 or y==5 or y==7 or y==8 or y==10 or y==12 )
	{
		cout<<"31";
		return 0;
		
	}
	else	cout<<"30";
	return 0;

}