#include<bits/stdc++.h>
using namespace std;

int j(int n,int b){
	unsigned int i=0,s=0;
	while(n){
		s+=n%b*pow(10,i++);
		n/=b;
	}
	while(n){
		if(n%10==0){
			return false;
		}
		n/=10; 
	}
	return true;
}

int main(){
	unsigned int a,b,c=0;
	cin>>a>>b;
	for(unsigned int i=a;i<=b;i++){
		if(j(i,5) && j(i,7) && j(i,9)){
			c++;
		}
	}
	cout<<c; 
	return 0;
}

无语了