Lucky Number program in java Solution

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.*;
class LuckyNum{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int n,m,sum = 0;
        System.out.println("Enter the car no:");
        m = sc.nextInt();
        if(m<1000){
            System.out.println(m+" is not a valid car number");
        }
        else{
            while(m>0){
                n=m%10;
                sum=sum+n;
                m=m/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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