use std::io::*;
use std::str::FromStr;

#[allow(dead_code)]
fn get_line() -> String {
    let stdin = stdin();
    let mut line = String::new();
    stdin.lock().read_line(&mut line).expect("io error.");
    line.trim().to_string()
}

#[allow(dead_code)]
fn get_word<T: FromStr>() -> T {
    (&get_line()).parse().ok().expect("parse error.")
}

#[allow(dead_code)]
fn get_vec<T: FromStr>() -> Vec<T> {
    (&get_line()).split(' ').map(|x| x.parse().ok().expect("parse error.")).collect()
}

fn main() {
    let n = get_word::<usize>();
    let _ = get_line();
    let mut v = vec![0; n];
    for i in 0..n {
        v[i as usize] = get_word::<i64>();
    }

    v.sort();
    println!("{}",
        v.last().unwrap() - v.first().unwrap());
}