SONGAY c++

#include<bits/stdc++.h>
using namespace std;
int t,n;
int main()
{
   // freopen("songay.inp","r",stdin);
 //   freopen("songay.out","w",stdout);
    cin>>t>>n;
    if (t==4||t==6||t==9||t==11) cout<<"30";
    if (t==1||t==3||t==5||t==7||t==8||t==10||t==12) cout<<"31";
    if (t==2)
    {
        if ((n%400==0)||((n%4 == 0) && (n%100 != 0))) cout<<"29";
        else cout<<"28";
    }
}