#include<bits/stdc++.h> using namespace std; int main(){ int a,b; cin>>a>>b; if(b1||b3||b5||b7||b8||b10||b12){ cout<<31; } else if(b4||b6||b9||b11){ cout<<30; } else if(b2){ if(a%4000){ cout<<29; } else if(a%40&&a%100!=0){ cout<<29; } else if(a%100==0) cout<<28; else cout<<28; } return 0; }

#include<bits/stdc++.h>
using namespace std;
int main(){
    int a,b;
    cin>>a>>b;
    if(b==1||b==3||b==5||b==7||b==8||b==10||b==12){
        cout<<31;
    }
    else if(b==4||b==6||b==9||b==11){
        cout<<30;
    }
    else if(b==2){
        if(a%400==0){
                cout<<29;
            }
        else if(a%4==0&&a%100!=0){
                cout<<29;
        }
        else if(a%100==0) cout<<28;
        else cout<<28;
    }
    return 0;
}

#include<bits/stdc++.h> using namespace std; int main() { int n,m; cin>>n>>m; if(n%40&&(n%100!=0||n%4000)){ if(m1||m3||m5||m7||m8||m10||m12){ cout<<"31"; } if(m4||m6||m9||m11){ cout<<"30"; } if(m2){ cout<<"29"; } } else{ if(m1||m3||m5||m7||m8||m10||m12){ cout<<"31"; } if(m4||m6||m9||m11){ cout<<"30"; } if(m2){ cout<<"28"; } } return 0; }