Ошибка из-за нулей после чисел?

package com.javarush.task.task04.task0420;

/*
Сортировка трех чисел
*/

import java.io.*;
import java.util.Scanner;

public class Solution {
    public static void main(String[] args) throws Exception {
        Scanner a = new Scanner(System.in);
        Scanner b = new Scanner(System.in);
        Scanner c = new Scanner(System.in);

        double Na = a.nextDouble();
        double Nb = b.nextDouble();
        double Nc = c.nextDouble();

        double max = Nb;
        double inf = Double.NEGATIVE_INFINITY;

        ...
    }
}