#include <cstdio>
#include <cmath>
#define ll long long int
using namespace std;
inline ll cmmdc(ll a,ll b)
{
    ll r;
    r=a%b;
    while(r)
    {
        a=b;
        b=r;
        r=a%b;
    }
    return b;
}
int main()
{
    freopen("frac.in","r",stdin);
    freopen("frac.out","w",stdout);
    ll n,p,rez=0,k=0;
    scanf("%lld%lld",&n,&p);
    k=0;
    rez=1;
    while(k<=p)
    {
        if(cmmdc(rez,n)==1)
            k++;
        if(k==p+1)
            break;
        rez++;
    }
    printf("%lld",rez);
    return 0;
}