#include<stdio.h>
int n,p,i,contor;
int cmmdc(int a,int b);
int main()
{
	scanf("%d",&n);
	scanf("%d",&p);
	for(i=1;i<=2000000000;i++)
	{
		if(cmmdc(i,n)==1)
			contor++;
		if(p==contor)
		{
			contor=i;
			break;
		}
	}
	printf("%d",contor);
	return 0;
}

int cmmdc(int a,int b)
{
	while(a!=b)
	{
		if(a>b)
			a-=b;
		else
			b-=a;
	}
	return a;
}