JAVA 大佬们，这个代码咋就不行泥

import java.io.*;

import java.util.*;

public class Main {

public static void main(String args[]) throws Exception {
    Scanner write=new Scanner(System.in);
    int a = write.nextInt();
    float sum=1.0f;
    for(int i=1; i<=a ; i++){
        sum=sum+(float)(1.0/i);
    }
    System.out.println(sum);
}

}```