import java.io.*;
import java.util.*;

class Main
{
    public static void main(String args[])throws Exception
    {
        BufferedReader bu=new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb=new StringBuilder();
        String s[]=bu.readLine().split(" ");
        int ans=0,i,j,a[]=new int[5];
        for(i=0;i<5;i++) a[i]=Integer.parseInt(s[i]);

        for(i=a[0];i<=a[1];i++)
        for(j=a[2];j<=a[3];j++) ans=Math.max(ans,(i+j)%a[4]);
        System.out.print(ans);
    }
}