#include <bits/stdc++.h>

using i64 = long long;
using u64 = unsigned long long;
using u32 = unsigned;

using u128 = unsigned __int128;
using i128 = __int128;

const int MOD = 100003;

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

    i64 N, K;
    std::cin >> N >> K;
    K--;

    auto denum = [](i64 num) -> i64 {
        i64 ret = 0;
        for (int i = 1; i <= num / i; i++) {
            if (num % i == 0) {
                ret += i;
                if (i != num / i) ret += num / i;
            }
        }

        return ret;
    };

    std::vector<int> A;
    std::set<int> s;
    int p = 0;

    int cur = N, nxt;
    for (int i = 0; i < K; i++) {
        A.push_back(cur);
        s.insert(cur);
        nxt = denum(cur);
        if (s.count(nxt)) {
            while (p < A.size() && !s.count(A[p])) p++;
            int rem = (K - p) % (i - p);
            for (int _ = 0; _ < rem; _++) p++;
            std::cout << A[p] << '\n';
            return 0;
        }
        cur = nxt;
    }
    std::cout << cur << '\n';

    return 0;
}