#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;

}

#include using namespace std; int main(){ int a,b,c; scanf("%d%d",&a,&b); if(b1||b3||b5||b7||b8||b10||b12)c=31; else if(b4||b6||b9||b11)c=30; else if(b2&&a%400==0)c=29; else c=28; printf("%d",c); return 0; }

#include using namespace std; int main() { int a,b,c; scanf("%d%d",&a,&b); switch(b){ case 1:case 3:case 5:case 7:case 8:case 10: case 12:c=31;break; case 4:case 6:case 9:case 11:c=30;break; case 2:{ if((a%4000)||((a%40)&&(a%100!=0))) c=29; else c=28; break; } } printf("%d\n",c); return 0; }