#include <iostream>
#include <fstream>
int n,p,k,i;
using namespace std;

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

int main()
{
    ifstream f ("frac.in");
    ofstream g ("frac.out");
    f>>n>>p;
    k=0;i=1;
    while(k<p)
    {
        if(cmmdc(i,n)==1)
            k++;
            i++;
    }
    g<<i-1;


    return 0;
}