本地OK，提交全RE。多谢指正

import java.util.Scanner;

class TTest02 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double x = scanner.nextDouble();
        double bu = 2.0;
        double sum = bu;
        int bushu = 1;
        while (sum < x){
            bu = bu * 0.98;
            sum += bu;
            bushu++;
        }
        System.out.println(bushu);
    }
}