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

Input: Consider Input: Problem: assume that f ( 1 ) = 0 and f ( m + n ) = f ( m ) + f ( n ) + 4 ( 9 mn - 1 ) . for all natural numbers ( integers > 0 ) m and n . what is the value of f ( 17 ) ?

Output: 4832


Input: Consider Input: Problem: if ( 2 ^ 16 ) ( 25 ^ s ) = 5 ( 10 ^ m ) what is the value of m ?

Output: 16


Input: Consider Input: Problem: sachin is younger than rahul by 4 years . if the ratio of their ages is 7 : 9 , find the age of sachin


Output: 1