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

  }

}