You will be given a sentence. Check whether the sentence is grammatically correct and is meaningful. If the sentence is grammatically correct, then answer with '1', otherwise answer with '0'.

Example Input: The sign warned against skating on the pond.
Example Output: 1

Example Input: The average age at which people begin to need eyeglasses vary considerably.
Example Output: 0

Example Input: The harder it rains, how much faster a flow do you see in the river?
Example Output:
1