#include using namespace std; int main() { int x,y,c,q,w,e; cin>>x>>y; switch(y){ case 1: case 3: case 5: case 7: case 8: case 10: case 12: c=31; break;

}
	q=x%4;
w=x%100;
e=x%400;
switch(y){
	
	case 4:
	case 6:
	case 9:
	case 11:
	c=30;
	break;
	case 2:
		
	{
	if((y==2)&&(q==0)&&(w!=0)||(e==0))
c=29;
else 
c=28;
break;

}

} cout<<c; return 0;

}