TASK DEFINITION: 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'.
PROBLEM: No candidate can predict how many people will vote for him.

SOLUTION: 1

PROBLEM: Who did Mary see walking toward the railroad station?

SOLUTION: 1

PROBLEM: What does John think Mary bought?

SOLUTION:
1