#include<iostream>
using namespace std;

int main()
{
    int n, k;
    scanf("%d %d",&n,&k);
    int cnt = 0;
    int arr[10000];
    int j = 0;
    for (int i = 1; i <= n; i++) {
        if (n % i == 0) {
            arr[j] = i;
            j++;
            cnt++;
        }
    }
    if (cnt >= k){
        printf("%d",arr[k-1]);
    }
    else{
        printf("0");
    }
    return 0;
}

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