Start with 5, cross over to 2 on the b natural, cross over to 3 (or 2 if you have above average hands) on the G, land on 1 with the middle C, cross over to 2 for b natural, back over to 1 on middle C, land 2 on G, 4 (or 3) on B flat and you should be good to go here it is all together: 5-4-3-2-1-2-3-4-3-2-1-4-3-2-1-3/2-1-2-1-2-3/4-2/3-1-2-3-1-3-2-4-3-2-3-1