import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
		int m = sc.nextInt();
		sc.close();

		int ans = 0;
		for (int i = a; i <= b; i++) {
			for (int j = c; j <= d; j++) {
				ans = Math.max(ans, (i + j) % m);
			}
		}
		System.out.println(ans);
	}
}