package imei;

public class Imei {

    public static void main(String[] args) {
       boolean a = isValidIMEI("123123-12-432341-3"); // should be correct
       System.out.println(a);
       a = isValidIMEI("123122-34-342331-2"); // should be incorrect
       System.out.println(a);
    }

    public static boolean isValidIMEI(String imei){
        imei = imei.replaceAll("-","");
        if(imei.length() < 15)
            return false;
        int sum_even = 0;
        for(int i=0; i<7; i++){
            char temp = imei.charAt(i*2);
            int number = Integer.parseInt(String.valueOf(temp));
            sum_even += number;
        }
        int sum_odd = 0;
        int x = 0;
        for(int i=0; i<7; i++){
            char temp = imei.charAt(i*2+1);
            int number = Integer.parseInt(String.valueOf(temp));
            x = 2*number;
            if(x<10)
                sum_odd += x;
            else
                sum_odd += Math.floor(x/10) + x%10;
        }
        int sum = sum_even + sum_odd;
        int check_sum = Integer.parseInt(String.valueOf(imei.charAt(14)));
        int result = 0;
        if(sum%10 > 0){
            result = 10 - sum%10;
        }
        else{
            result = 0;
        }
        if(result == check_sum)
            return true;
        else return false;
    }

}