AC

#include <bits/stdc++.h>
using namespace std;
int a[]={0,31,28,31,30,31,30,31,31,30,31,30,31};
int main() {
int y,m,flag=0;
cin>>y>>m;
if(y%100!=0&&y%40||y%4000){
flag=1;
}
if(flag && m==2)cout<<a[m]+1;
else cout<<a[m];
return 0;
}