//
#include <cstdio>
int l,r,year,month,day;
bool judge(int n){
	year=n/10000;
	month=n%10000/100;
	day=n%100;
	if(n<l||n>r)return false;
	if(day>=32||month>=13)return false;
	if(day==31&&(month==2||month==4||month==6||month==9||month==11))return false;
	if(day==30&&month==2)return false;
	if(day==29&&month==2)
		if(year%400==0||year%4==0&&year%100!=0)return true;
		else return false;
	return true; 
}
using namespace std;
int main(){
	
	int ly,ry,tot=0;
	scanf("%d%d",&l,&r);
	ly=l/10000;
	ry=r/10000;
	for(int i=ly;i<=ry;i++){
		if(judge(i*10000+i%10*1000+i%100/10*100+i%1000/100*10+i/1000)==1)
		tot++;
	}
	printf("%d",tot);    
	return 0;
}