Java Lucky Number program

Question:-

William planned to choose a four-digit lucky number for his car. His lucky numbers are 3,5 and 7. Help him find the number, whose sum is divisible by  3 or 5 or 7.
Provide a valid car number, Fails to provide a valid input then display that number is not a valid car number. 

Note : The input other than 4 digit positive number[includes negative and 0] is considered as invalid.

Refer the samples, to read and display the data.

Sample Input 1:
Enter the car no:1234

Sample Output 1:
Lucky Number

Sample Input 2:

Enter the car no:1214

Sample Output 2:

Sorry it’s not my lucky number

Sample Input 3:

Enter the car no:14

Sample Output 3:

14 is not a valid car number

Code :-

import java.util.Scanner;
public class LuckyNum
{
    public static void main (String[] args) {
        Scanner sc= new Scanner(System.in);
        System.out.println("Enter the car no:");
        int num=sc.nextInt();
        if(num<1000 || num>9999)
        {
            System.out.println(num+" is not a valid car number");
        }
        else
        {int sum=0;
            while(num>0)
            {
                sum+=num%10;
                num/=10;
            }
            if(sum%3==0 || sum%5==0 || sum%7==0)
            {
                System.out.println("Lucky Number");
            }
            else
            {
                System.out.println("Sorry its not my lucky number");
            }
        }
    }
}

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