#include<bits/stdc++.h>
using namespace std;
int date1,date2;
int month,day,sum,dt1,dt2;
bool check(int date)
{
int a[5],k=date;
for(int i=1;i<=4;i++)
{
a[i]=k%10;
k/=10;
}
month=a[1]*10+a[2];
day=a[3]*10+a[4];
if((month==1||month==3||month==5||month==7||month==8||month==10||month==12)&&day<=31)return 1;
if((month==4||month==6||month==9||month==11)&&day<=30)return 1;
if((date%400==0|| (date%4==0&&date%100!=0))&&day<=29&&month==2)return 1;
if(!(date%400==0|| (date%4==0&&date%100!=0))&&day<=28&month==2)return 1;
return 0;
}
int main()
{
cin>>date1>>date2;
dt1=date1/10000;dt2=date2/10000;
for(int i=dt1;i<=dt2;i++)
{
if(check(i))sum++;
}
cout<<sum;
return 0;
}