import java.util.*;

public class Main {

    public static void main(String[] args) {
        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();
        int max = 0;
        for(int i = a ; i <= b ; i++){
        	for(int j = c ; j <= d ;j++){
        		int ans = (i+j)%m;
        		if(ans > max){
        			max = ans;
        		}
        	}
        }
        System.out.println(max);
    }
}