#include<bits/stdc++.h>
using namespace std;
int check(int x){
	int xx=x,cnt=0;
	vector<int>v(10);
	while(xx){
		v[xx%10]++;
		cnt++;
		xx/=10;
	}
	for(int i=0;i<cnt;i++)if(v[i]==0||v[i]>1)return 0;
	return 1;
}
int main(){
	int a,b,ans=0;
	cin>>a>>b;
	for(int i=1;i<=b;i++)ans+=check(i);
	cout<<ans;
	return 0;
}