#include<iostream>
#include<cmath>
#include<cstring>
#include<string>
#include<bits/stdc++.h>
#include<algorithm>
using namespace std;
int main()
{
	int a[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
	int n,y;
	cin>>y>>n;
	if(n!=2||y%4!=0||y%400!=0)
	{
		cout<<a[n];
		return 0;
	}
	cout<<29;
	return 0;
}
  

为什么第四个点过不了？