Task: Question Answering
Input (English): Problem: the smallest number when increased by ` ` 1 ` ` is exactly divisible by 12 , 18 , 24 , 32 and 40 is : 
Options: a ) 1439 , b ) 1440 , c ) 1459 , d ) 1449 , e ) 1500
Output (English): a