#include<bits/stdc++.h>
using namespace std;
int a,b,cnt=-1,x[1000]={10,102,120,201,210,1023,1032,1203,1230,1302,1320,2013,2031,2103,2130,2301,2310,3012,3021,3102,3120,3201,3210,10234,10243,10324,10342,10423,10432,12034,12043,12304,12340,12403,12430,13024,13042,13204,13240,13402,13240,14023,14032,14203,14230,14302,14320,20134,20143,20314,20341,20413,20431,21034,21043,21304,21340,21403,21430,23014,23041,23104,23140,23401,23140,24013,24031,24103,24130,24301,24310,30124,30142,30214,30241,30412,30421,31024};
int main(){
	cin>>a>>b;
	while(1){
		cnt++;
		if(x[cnt]>=a){
			break;
		}
	}
	int cnt1=cnt;
	while(1){
		cnt++;
		if(x[cnt]>b){
			break;
		}
	}
	cout<<cnt-cnt1;
	return 0;
}