#include<iostream>
#include<fstream>
using namespace std;
int prim(int a,int b)
	{while(a!=b)
		if(a>b)
			a=a-b;
		else b=b-a;
	return a;}	
int main()
{ifstream f("frac.in");
ofstream g("frac.out");
int n,i,j,p,ok;
f>>n;
f>>p;
i=1;
j=0;
while(j<p)
	{if(prim(i,n)==1)
		j++;
	i++;
	}
g<<i-1;
f.close();
g.close();
}