#include<fstream>
using namespace std;
unsigned long long i,k,n;
int cmmdc(int a,int b)
{
    int r;
    while(b)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main()
{
    ifstream f("frac.in");
    ofstream g("frac.out");
    f>>n>>k;
    while(k!=0)
    {
        i++;
        if(cmmdc(n,i)==1)
        k--;
    }
    g<<i;
    return 0;
}