#include <bits/stdc++.h>
#define ll long long
using namespace std;
ifstream f("frac.in");
ofstream g("frac.out");
ll n, p;
ll cmmdc(ll a, ll b)
{
    while(b)
    {
        ll r=a%b;
        a=b;
        b=r;
    }
    return a;
}
int main()
{
    f>>n>>p;
    ll r=1;
    while(p)
    {
        if(cmmdc(r, n)==1) p--;
        r++;
    }
    g<<r-1;
    return 0;
}