The task is to generate the correct answer for a given math problem.

Input: Consider Input: Problem: calculate the sum of first 60 natural numbers .

Output: 1830


Input: Consider Input: Problem: solve the equation for x : 6 x - 47 + 3 x = 4 + 9 - x

Output: 


Input: Consider Input: Problem: if a : b = 3 : 4 , b : c = 7 : 9 , c : d = 5 : 7 , find a : d ?


Output: 5 / 12