12. The song of the wheels

package NestedLoopsMoreEx;

import java.util.Scanner;

public class TheSongOfTheWheels {
    public static void main(String[] args) {
        Scanner scanner = new Scanner (System.in);

        int M = Integer.parseInt ( scanner.nextLine () );

        int passCount = 0;
        int fourthComb = 0;

        int x1 = 1;
        int x2 = 1;
        int x3 = 1;
        int x4 = 1;

        for ( int a = 1; a <= 9; a++){
            for ( int b = 1; b <= 9; b++) {
                for (int c = 1; c <= 9; c++) {
                    for (int d = 1; d <= 9; d++) {
                        if (a < b && c >d && a * b + c * d == M){
                            passCount++;
                            System.out.printf ( "%d%d%d%d ", a, b, c, d );

                            if (passCount == 4){
                                x1 = a;
                                x2 = b;
                                x3 = c;
                                x4 = d;
                            }
                        }
                    }
                }
            }
        }
        if (passCount >= 4){
            System.out.println ();
            System.out.printf ( "Password: %d%d%d%d", x1, x2, x3, x4 );
        } else {
            System.out.println ();
            System.out.print ( "No!" );
        }
    }
}