我的“最低常见多重”程序挂起，并没有输出答案

I have been trying to get more into programming, so I've been trying to make a simple program that takes two numbers as input, and computes the lowest common multiple. I did this in Python because I don't know how to take input in Java. What happens now is the program just hangs after I input my numbers, and nothing happens. Any pointers here would be greatly appreciated. Thank you.I have been trying to get more into programming