#![allow(unused_imports)]
#![allow(non_snake_case, unused)]

use std::cmp::*;
use std::collections::*;
use std::ops::*;
use std::marker::*;

use proconio::*;
use proconio::marker::*;
 
const INF: i64 = std::i64::MAX/100;
const MOD: i64 = 1_000_000_007;
// const MOD: i64 = 998244353;

#[fastout]
fn main() {
    input! {
        (a,b,c,d,m): (i64,i64,i64,i64,i64),
    }
    let mut ans = 0;
    for x in a..=b {
        for y in c..=d {
            let v = (x+y)%m;
            ans = ans.max(v);
        }
    }
    println!("{}",ans);
}