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

Ex Input:
Black adults have three to _ times greater incidence of bacteremia, compared with white adults.

Ex Output:
five

Ex Input:
Premolars have one, two, and sometimes _ canals.

Ex Output:
three

Ex Input:
Infertility affects about _ million American men.

Ex Output:
two