#include <fstream>
using namespace std;
int main()
{
 unsigned long n,v[10000],indice,fact,i,p,numarator,fractii;
 ifstream f("frac.in");
 f>>n>>p;
 f.close();
fact=2;indice=0;
 while(n>1)
 {   if (n%fact==0)
     {v[++indice]=fact;
      while(n%fact==0)
         n=n/fact;}
      fact++;
         }
         int ok;
        numarator=1;fractii=1; 
 
 
 
 
  while (fractii<p)
  {
  numarator++;
               ok=1;
        for(i=1;i<=indice;i++)
       if (numarator%v[i]==0){ok=0; break;}
       if (ok) fractii++;
       }
       ofstream g("frac.out");
       
       g<<numarator;
       g.close();
        //system("pause");
        return  0;
        }