import java.util.Scanner;

public class Geburtsparadoxon {
	public static void main(String[] args) {

		Scanner scanner = new Scanner(System.in);

		System.out.print("Wie viele Versuche? ");
		double t = scanner.nextDouble();
		System.out.print("Wie viele Personen? ");
		int n = scanner.nextInt();

		int[] a = new int[n];
		double gleich = 0;
		boolean check = false;

		for (double i = 0; i < t; i++) {
			for (int j = 0; j < a.length; j++) {
				a[j] = (int) (Math.random() * 364 + 1);
			}
			for (int k = 0; k < n; k++) {
				for (int l = 0; l < n; l++) {
					if (a[k] == a[l] && k != l) check = true;
				}
			}
			if (check) gleich++;
			check = false;
		}
		System.out.println("Wahrscheinlichkeit: " + (gleich / t * 1.0));
	}
}