解

#include<iostream>
using namespace std;
bool isr(short y)
{
	if(y%4==0&&y%100!=0||y%400==0)
	return true;
	return false; 
} 
int main()
{
	short year,month;
	cin >> year >> month;
	if(month==2)
	{
		if(isr(year)==1)
		cout << 29;
		else
		cout << 28;
	}
	else if(month==1||month==3||month==5||month==7||month==8||month==10||month==12)
	cout << 31;
	else
	cout << 30;
}