43分求调

#include <bits/stdc++.h>
using namespace std;

int main(){
	int a, b;
	cin >> a, b;
	if(b == 4 || b == 6 || b == 9 || b == 11 ) cout << 30;
	else if(b == 2){
		if((a % 4 == 0 && a % 100 != 0) || a % 400 == 0) cout << 29;
		else cout << 28;
	}
	else cout << 31;
	return 0;
}