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762A.cpp
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762A.cpp
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#include<bits/stdc++.h>
using namespace std;
#define ll long long int
int main()
{
ll n , k;
cin >> n >> k;
vector < ll > ans;
ll count = 0;
for(ll i = 1; i * i <=n; i ++)
{
if( n % i == 0)
{
count++;
if( n / i != i)
count ++;
}
}
ll a = 1;
ll b = count;
if( k > count )
cout << "-1" << endl;
else
{
for(ll i = 1; i*i<=n; i ++)
{
if( n % i == 0)
{
if(k == a)
{
cout << i << endl;
break;
}
else if( k== b)
{
cout << n / i << endl;
break;
}
else
{
a ++;
b --;
}
}
}
}
}