Reach money maker deal!

There is a monthly Register Reward deal:
Buy (2) & get $1 RR
Buy (3) & get $2 RR
Buy (4) or more & get $4 RR
Deal scenario:
Buy 4 Reach Crystal Clean Toothbrushes at $1.59 each, use 4 $1 MQ and then have then use the in ad coupon and get 4 RRs. Buy something else to cover the 4 cents overage.
 
Thanks Amy!