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

Example Input: Silks are susceptible to infection during the first _ days after initiation.
Example Output: five

Example Input: Statistics show, however, that men are _ times more likely to be lefty than women.
Example Output: three

Example Input: Concentricity is _ for a 'perfect' tube.
Example Output:
zero