#include 
using namespace std;

int main() {
    int m, g;
    cin >> m >> g;
    
    if(m == 2) {
        if(g % 400 == 0) {
            cout << 29 << endl;
        }
        else if(g % 4 == 0 and g % 100 != 0) {
            cout << 29 << endl;
        }
        else {
            cout << 28 << endl;
        }
    }
    else if(m == 1 or m == 3 or m == 5 or m == 7 or m == 8 or m == 10 or m == 12) {
        cout << 31 << endl;
    }
    else {
        cout << 30 << endl;
    }
    return 0;
}