#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("frac.in");
ofstream fout("frac.out");
int cmmdc(int a,int b)
{
    while(a!=b)
    {
        if(a>b)
            a=a-b;
        else
            b=b-a;

    }
    return a;
}
int main()
{
    int n,nr,k=0,m=1;
    fin>>n>>nr;
    while(k!=nr)
    {
        if(cmmdc(m,n)==1)
            k++;
        m++;

    }
    m--;
    fout<<m;
    return 0;
}