#include<bits/stdc++.h>
typedef long long ll;
using namespace std;
ll a,b,rs,p,A[20],n,P[20];

void dec(int x){
	if(x == 0) return;
	dec(x/10);
	++n;
	A[n]=x%10;
}

int main(){
	ios_base::sync_with_stdio(0);cin.tie(0);
	cin >> a >> b;
	if(a>10) return cout << 0,0;
	b-=1;
	dec(b);
	
	P[0]=1;

	for(int i = 1;i<=n;i++) P[i] = P[i-1]*(10-a);
	
	for(int i = 1;i<=n;i++){
		if(A[i] < a) return cout << rs,0;
		rs+=(A[i]-a+1)*P[n-i];
	}
	cout << rs;
}