低调

#include <iostream>
using namespace std;
int f[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
bool check(int x){
    return x%4==0&&x%100!=0||x%400==0;
}
int main(){
	int n,y;
	cin>>n>>y;
	if(check(n))f[2]=29;
	cout<<f[y];
	return 0;
}