#include <stdio.h>
int is_uruu(int year){
	if((year%4==0 && year%100!=0)|| year%400==0){
		return 1;
	}
	else return 0;
}
int maxday_of_month(int y, int m){
	int md;
	if(m==2){
		if(is_uruu(y)==1){
			md=29;
		}
		else md=28;
	}
	if(m==4||m==6||m==9||m==11){
		md=30;
	}
	if(m==1||m==3||m==5||m==7||m==8||m==10||m==12){
		md=31;
	}
	return md;
}
int main(void) {
	int y,m;
	scanf("%d,%d",&y,&m);
	printf("%d",maxday_of_month(y,m));
	return 0;
}
 

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MjAyMCwy

2020,2