#include <fstream>

using namespace std;

ifstream fin("frac.in");
ofstream fout("frac.out");

int cmmdc(int a,int b)
{
    int r;
    while(b)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main()
{
    long n,p,i,k=1;
    fin>>n>>p;
    for(i=1;k<=p;i++)
       if(cmmdc(i,n)==1)
            k++;
    fout<<i-1;
}