#include<iostream>
using namespace std;
int main()
{
 unsigned long long a,b,c,d;
 cin>>a>>b;
 if(a%9==0) a=a/9-1;
 else a=a/9;
 b=b/9;
 if(a%10>6) c=(a-a%10)*6/10+6;
 else c=(a-a%10)/10*6+a%10;
 if(b%10>6) d=(b-b%10)*6/10+6;
 else d=(b-b%10)/10*6+b%10;
 cout<<d-c<<endl;
 return 0;
}
 