#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[]={0,31,28,31,30,31,31,30,31,30,31};
    if(month==2){
        int is_leap((year%d4==0)&&year%100!=0))||(year%400=0);
        if(is_leap){
            days_in_month[2]=29;    
            }
    }
    printf("%d",days_in_month[month]);
       

    
return 0;
}