fn main() {
	let mut s = String::new();
	std::io::stdin().read_line(&mut s).ok();
	let n: Vec<usize> = s.split_whitespace().flat_map(str::parse).collect();
	let a = (n[0] + n[2]..=n[1] + n[3]).map(|x| x % n[4]).max().unwrap();
	println!("{}", a);
}