Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.

Input: Consider Input: Irrigation can increase land productivity by three to ____ times, especially in the north.

Output: seven


Input: Consider Input: Differentiation is caused by the energy going in ____ directions.

Output: two


Input: Consider Input: African elephants weigh up to ____ tons which is heavier than most vehicles.


Output: seven