#include <iostream>
using namespace std;

int main()
{
int Thang;
cout<<"Ban muon xem so ngay cua thang nao: ";
cin>>Thang;
switch(Thang)
{
case 1:case 3: case 5: case 7: case 8: case 10: case 12:
cout<<"Thang Nay co 31 ngay";
break;
case 4: case 6: case 9: case 11: cout<<"Thang nay co 30 ngay";
break;
case 2: goto lab;
break;
default: cout<<"Thang ban nhap khong ton tai";
break;
lab:
	int nam;
	cout<<" Ban muon xem thang 2 cua nam nao";
	cin>>nam;
	if (nam%4==0) cout<<"Thang Nay co 29 ngay";
	else cout<<"Thang nay co 28 ngay";
}
}