hello codeforces , I am a beginner coder , you can imagine very beginner , I am trying to code matrix exponential for nth fibonacci number , but , I find a bug.

the fibonacci series is : 0,1,1,2,3,5,8,13,21.... my code generates : 0,1,1,2,5,21,144,1597,28657.....

please help me finding the bug , I oblige :( :( my code : https://paste.ubuntu.com/26187218/