package testProje;
import java.util.Scanner;

public class problemB {
	public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
		while(sc.hasNext()) {
			double x1 = sc.nextDouble();
			double y1 = sc.nextDouble();
			double x2 = sc.nextDouble();
			double y2 = sc.nextDouble();
			double p = sc.nextDouble();

			double cal = (double) (Math.pow((x1-x2), p) + Math.pow((y1-y2), p));
			double ans = (double) Math.pow(cal, (1/p));
			System.out.printf("%.10f \n", (Math.abs(ans)));
		}
		sc.close();
	}
}