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

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    long long N,K; cin >> N >> K;
    vector<long long> multi(20);
    long long m = 1;
    for(int i=0; i<20; i++){
        multi.at(i) = m;
        m *= (N%10)+1;
        N /= 10;
    }
    long long answer = 0; K--;
    for(int i=19; i>=0; i--){
        answer *= 10;
        answer += K/multi.at(i);
        K %= multi.at(i);
    }
    cout << answer << endl;
}