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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin ("frac.in");
ofstream fout ("frac.out");
int main()
{
long long n,p,nr=2;
fin>>n>>p;
p=p-1;
while(p>0)
{
int val=1;
for(int i=2;i<=n;i++)
{
if(nr<i)
{
i=n;
}
if(n%i==0 && nr%i==0)
{
val=0;
i=n;
}
if(i!=2)
{
i++;
}
}
if(val==1)
{
p--;
}
nr++;
}
fout <<nr-1;
return 0;
}