#include<bits/stdc++.h>
using namespace std;
int a[20]={1,22,122,212,221,333,1333,3133,3313,3331,4444};
int main(){
 int l,r,sum=0;
 cin>>l>>r;
 for(int i=0;i<=10;i++)
   if(a[i]>=l&&a[i]<=r)sum+=a[i];
 cout<<sum;
 return 0;	
}