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#include<fstream>
using namespace std;
ifstream f("frac.in");
ofstream g("frac.out");
long long n,p,v[100],q=1;
int main()
{
f>>n>>p;
long long d=2;
while(n>1)
{
if(n%d==0)
{
v[q]=d;
++q;
while(n%d==0)
n/=d;
}
++d;
}
int j=1;
--p;
if(p)
j=2;
while(p)
{
int ok=1;
for(int i=1;i<q;++i)
if(j%v[i]==0)
{
ok=0;
break;
}
if(ok)
--p;
++j;
}
g<<j-1<<'\n';
return 0;
}