#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 1000000000000000001

int main(){
	
	long long N,K;
	cin>>N>>K;
	K--;
	vector<long long> c;
	c.push_back(1);
	while(N!=0){
		long long cur = N%10;
		N /= 10;
		c.push_back(c.back() * (cur+1));
	}
	long long t = 1;
	long long ans = 0;
	rep(i,c.size()){
		while(K>0){
			if(i+1!=c.size() && K%c[i+1]==0)break;
			K -= c[i];
			ans += t;
		}
		t *= 10;
		
	}
	cout<<ans<<endl;
    return 0;
}