import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


public class Main {
    public static void main(String[] args) {
        foo();
    }


    static void foo() {
        int src = getProperValue();
        System.out.println("scr = " + src);

        int dst = getProperRand();
        int count = 1;
        while (src != dst) {
            dst = getProperRand();
            count++;
        }

        System.out.println("count = " + count);
    }

    static int getProperRand() {
        int rand = new Random().nextInt(9_000_000);
        int l = 1_000_000;
        return l + rand;
    }

    static int getProperValue() {
        System.out.println("Write digit more 1 000 000 and less than 10 000 000");

        Scanner scanner = new Scanner(System.in);

        String v = scanner.next();
        while (!Optional.ofNullable(v)
                .filter(Main::isDigit)
                .isPresent()) {
            System.out.println("Not correct");
            System.out.println("Write digit more 1 000 000 and less than 10 000 000");
            v = scanner.next();
        }

        return Integer.valueOf(v);

    }

    static boolean isDigit(String s) {
        Pattern p = Pattern.compile("^\\d{7}$");
        Matcher m = p.matcher(s);

        return m.matches();
    }

}