题解

#include<bits/stdc++.h>
using namespace std;
int main(){
int a,b;
cin>>a>>b;
if(b2){
if(a%4000||(a%40&&a%100!=0)){
cout<<"29";
return 0;
}
cout<<"28";
return 0;
}
if(b4||b6||b9||b==11){
cout<<"30";
return 0;
}
cout<<"31";
return 0;
}