fn main() {
	let mut s = String::new();
	std::io::stdin().read_line(&mut s).ok();
	let s: Vec<i32> = s.trim().split_whitespace()
		.map(|e| e.parse().unwrap()).collect();
	let a = s[0];
	let b = s[1];
	let c = s[2];
	let d = s[3];
	let m = s[4];
	if (a + c) / m < (b + d) / m { println!("{}", m - 1); }
	else {println!("{}", (b + d) % m); }
}