#include<iostream>
#include<cstring>
#include<string>
#include<cstdio>
#include<cmath>
#include<algorithm>
using namespace std;
bool run(int a){
	if(a%4 == 0&&a%100!=0||a%400==0){
		return true;
	}else return false;
}
bool fun(int m,int n,int p){
	int m1 = m%100;
	int m2 = m/100;
	if(m1%10*10+m1/10 == n&&m2%10*10+m2/10 == p){
		return true;
	}else return false;
}
int d1,d2;
int cnt=0;
int dm[13] = {0,31,28,31,30,31,30,31,31,30,31,30,31};
int main(){
	cin >> d1 >> d2;
	for(int i=d1;i<=d2;i++){
		int year = i/10000;
		int month = i/100%100;
		int day = i%100;
		if(month<1||month>12){
			continue;
		}
		if(run(year)){
			dm[2] = 29;
		}else{
			dm[2] = 28;
		}
		if(day >=1&&day <= dm[month]){
			if(fun(year,month,day)){
				cnt++;
			}
		}else{
			continue;
		}	
	} 
	cout << cnt;
	return 0;
}