include<stdio.h>

int main() { int year,month,a; while(scanf("%d %d",&year,&month)!=EOF) switch(month) { case 1: case 3: case 5: case 7: case 8: case 10: case 12:printf("31\n");break; case 2:if(year%400==0||(year%4==0&&year%100!=0)) printf("29\n"); else printf("28\n");break; case 4: case 6: case 9: case 11:printf("30\n");break; } return 0; }