#include <iostream>
#include <fstream>
using namespace std;
ifstream f("frac.in");
ofstream g("frac.out");
int nr, n, p, contor, x=0;

int cmmdc(int a, int b)
{
    int c;
    while (b)
    {
        c=a%b;
        a=b;
        b=c;
    }
    return a;
}

int main()
{
    f>>n>>p;
    while (contor<p)
    {
        x++;
        if (cmmdc(x,n)==1)
        contor++;
    }
    g<<x;
    return 0;
}