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'.

Ex Input:
It's probable that in general he understands what's going on.

Ex Output:
1


Ex Input:
Oliver ascribed his longevity there.

Ex Output:
0


Ex Input:
The proof that this set is recursive is difficult.

Ex Output:

1