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

Input: Consider Input: Many prosimians have at least _ nipples and produce litters rather than a single offspring.

Output: four


Input: Consider Input: Acrobats mount a single bicycle until _ people in all are stacked on top of it.

Output: ten


Input: Consider Input: Forests are made up of at least _ strata of vegetation.


Output: three