#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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