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: Mary has never kissed a man taller than John is.
Example Output: 0

Example Input: It's probable that in general he understands what's going on.
Example Output: 1

Example Input: Columbus believed that the earth was round.
Example Output:
1