Contest1389/1389L.cpp

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