Dayz.java

package org.gd.mater;

public class Dayz {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		Runnable run1 = new Runnable() {
			@Override
			public void run() {
				for (int i = 0; i < 250000000; i++) {
					long wert = rekursion(i, 20);

					if (wert == 868601617) {
						System.out.print(i + ": ");
						System.out.println(wert == 868601617);
					}
				}

			}
		};
		Runnable run2 = new Runnable() {
			@Override
			public void run() {
				for (int i = 250000000; i < 500000000; i++) {
					long wert = rekursion(i, 20);

					if (wert == 868601617) {
						System.out.print(i + ": ");
						System.out.println(wert == 868601617);
					}
				}

			}
		};
		Runnable run3 = new Runnable() {
			@Override
			public void run() {
				for (int i = 500000000; i < 750000000; i++) {
					long wert = rekursion(i, 20);

					if (wert == 868601617) {
						System.out.print(i + ": ");
						System.out.println(wert == 868601617);
					}
				}

			}
		};
		Runnable run4 = new Runnable() {
			@Override
			public void run() {
				for (int i = 750000000; i < 1000000000; i++) {
					long wert = rekursion(i, 20);

					if (wert == 868601617) {
						System.out.print(i + ": ");
						System.out.println(wert == 868601617);
					}
				}

			}
		};
		new Thread(run1).start();
		new Thread(run2).start();
		new Thread(run3).start();
		new Thread(run4).start();
	}

	private static long rekursion(long wert, long laeufe) {

		laeufe--;
		if (laeufe < 0) {
			laeufe = 1337;
		} else if (laeufe == 0) {
			rekursion(wert - 1, 0);
		} else {

			switch ((int) wert % 5) {
			case 0:
				wert += 9781;
				break;
			case 1:
				wert += 1337;
				break;
			case 2:
				wert -= 9781;
				break;
			case 3:
				wert += 1337;
				wert *= 1337;
				break;
			case 4:
				wert -= 9781;
				break;
			default:
				wert *= -42;
			}

			wert %= 987654321;

			wert = rekursion(wert, laeufe);
		}

		return wert;
	}

}