#[allow(dead_code)]
pub mod ut {
    #[macro_export]
    macro_rules! input {
        ( string ) => {{
            let mut buf = String::new();
            std::io::stdin()
                .read_line(&mut buf)
                .map(|_| buf.trim().to_string())
                .unwrap()
        }};
        ( [ $t:ty ] ) => {{
            input!(string)
                .split_ascii_whitespace()
                .map(|x| x.parse::<$t>().unwrap())
                .collect::<Vec<_>>()
        }};
        ( ( $($t:ty ),* ) ) => {{
            let buf = input!(string);
            let mut it = buf.split_ascii_whitespace();
            ( $( it.next().map(|x| x.parse::<$t>().unwrap() ).unwrap(), )* )
        }};
        ( $($x:tt),* ) => {{
            { ( $( input!($x) ),* ) }
        }};
    }
}

fn main() {
    let (a, b, c, d, m) = input! {(usize, usize, usize, usize, usize)};
    let ans = {
        let mut ans = 0usize;
        for ix in a..=b {
            for iy in c..=d {
                ans = std::cmp::max(ans, (ix + iy) % m);
            }
        }
        ans
    };

    println!("{}", ans);
}