#include<iostream>
using namespace std;
int main()
{
 unsigned long long a,b,br=0,c;
 cin>>a>>b;
 for(int i=a;i<=b;i++)
 {if(i%9==0) c=(i/9)%10;
 else c=9;
 if(c<6)br++;}
 cout<<br<<endl;
 return 0;
}