#include <iostream>
#include <fstream>
using namespace std;
ifstream f("frac.in");
ofstream g("frac.out");
long long int n,p,m,aux1,aux2;
int main()
{
    f>>n>>p;
    while(p>0)
        {
            m++;
            aux1=n;
            aux2=m;
            while(aux1!=aux2)
                if(aux1>aux2)
                    aux1=aux1-aux2;
                else
                    aux2=aux2-aux1;
            if(aux2==1)
                p--;
        }
    g<<m;
    return 0;
}