#include<bits/stdc++.h>
using namespace std;
int n,m,cnt,sum;
int z[100]={0,10,
120,102,210,201,
1230,1203,1302,1320,1023,1032,2013,2031,2103,2130,2301,2310,
41230,41203,41302,41320,41023,41032,42013,42031,42103,42130,42301,42310,
31240,31204,31402,31420,31024,31042,32014,32041,32104,32140,32401,32410,
21430,21403,21304,21340,21043,21034,24013,24031,24103,24130,24301,24310,
14230,14203,14302,14320,14023,14032,12043,12034,12403,12430,12304,12340,};
signed main(){
	ios::sync_with_stdio(false);
	cin.tie(0);cout.tie(0);
	cin>>n>>m;
	for(int i=n;i<=m;i++){
		for(int j=0;j<66;j++){
			if(i==z[j]) cnt++;
		}
	}
	cout<<cnt;
}