In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Ex Input:
Some dentists prefer using the oral rinse for _ to five days at a time.

Ex Output:
three


Ex Input:
Diatoms are in _ shells and make the water brown.

Ex Output:
two


Ex Input:
Silicone is now _ times as expensive as rubber.

Ex Output:

six