输入数字：
Exception in thread "main" java.util.InputMismatchException
	at java.base/java.util.Scanner.throwFor(Scanner.java:977)
	at java.base/java.util.Scanner.next(Scanner.java:1632)
	at java.base/java.util.Scanner.nextInt(Scanner.java:2297)
	at java.base/java.util.Scanner.nextInt(Scanner.java:2251)
	at MyClass.main(Main.java:8)