#include <bits/stdc++.h>

using ll = std::int64_t;

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

    ll N, K;
    std::cin >> N >> K;

    std::vector<ll> factor;
    {
        ll n = N, f = 1;
        for(int i=0;i<=18;i++){
            factor.emplace_back(f);
            f *= n % 10 + 1;
            n /= 10;
        }
    }

    ll res = 0, k = K - 1;
    for(int i=18;i>=0;i--){
        res *= 10;
        res += k / factor[i];
        k %= factor[i];
    }

    std::cout << res << std::endl;
}