void main()
{
	int f(int m,int n);
	int m,n,k;
	scanf("%d%d",&n,&m);
	while (m!=0&&n!=0)
	{
	k=f(m,n);
	printf("%d\n",k);
	scanf("%d%d",&n,&m);
	}

}


int f(int m,int n)
{
	int k;
	if (n==1) k=1;
	else 
	{
		k=f(m,n-1);
		k=(k+m%n)%n;
		if (k==0) k+=n;
	}
	return k;
}