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'.

Q: Why can't the man who usually cuts the grass do so today?

A: 1
****
Q: Which packages didn't Sam pick up which are to be mailed tomorrow until it had stopped raining?

A: 0
****
Q: The politician perjured his aide.

A:
0
****