int main()
{
	int m,n,k,i,b;
	for(i=0;i<20000;i++){
	    scanf("%d%d",&n,&m);	
	    if(m==0&&n==0)
			break;
		else {
	       if(n==1)
			  printf("%d\n",n);
		   else{
		      k=0;
		      for(b=2;b<=n;b++){
			     k=((m%b)+k)%b;
			  }
		      printf("%d\n",k+1);
		   }
		}
	}
	return 0;
}