In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Input: Consider Input: Problem: find a sum for 1 st 7 prime number ' s ? 
Options: a ) 25 , b ) 28 , c ) 58 , d ) 34 , e ) 36

Output: c


Input: Consider Input: Problem: of the final grades received by the students in a certain math course , 1 / 5 are a ' s , 1 / 4 are b ' s , 1 / 2 are c ' s , and the remaining 30 grades are d ' s . what is the number of students in the course ? 
Options: a ) 80 , b ) 110 , c ) 160 , d ) 600 , e ) 400

Output: d


Input: Consider Input: Problem: if a ( a + 7 ) = 18 and b ( b + 7 ) = 18 , where a ≠ b , then a + b = 
Options: a ) − 48 , b ) − 2 , c ) − 7 , d ) 46 , e ) 48


Output: c