#include <stdio.h>
int main(){
   int month,year;
   scanf("%d%d",&month ,&year);
   if(month<1 || month>12){
       printf("Invalid input\n");
       return 0;
       int days_in_month[]={0,31,28,31,30,31,30,31,31,30,31,30,31};
       if(month==2){
           int is_leap =((year % 4 == 0)&&
           (year % 100 != 0))|| (year % 400 == 0);
           if(is_leap) {
               days_in_month[2] = 29;
           }
       }
       printf("%d\n",days_in_month[month]);
       return 0;
   }