pic $1$ and $2$ is the requirement of java code

pic $3$ is my code can successfully run but can't pass some testcases$($need to consider all the case by user input, non positive interger is a hint$)$

pic $4$ shows potential case why my code can't pass some testcases

Based on pic $4$ fix the code on pic $3$ that can fit the case

Ensure that modifications are independent and without using Al$.$ Thank you.