Legit reversing - only brute force 2^16 with known condition

[writeup](https://hgarrereyn.gitbooks.io/th3g3ntl3man-ctf-writeups/content/2017/picoCTF_2017/problems/reverse/MIPS/MIPS.html)

Original writeup (https://hgarrereyn.gitbooks.io/th3g3ntl3man-ctf-writeups/content/2017/picoCTF_2017/problems/reverse/MIPS/MIPS.html).