const DX: [i32; 8] = [0, 1, 0, -1, 1, 1, -1, -1];
const DY: [i32; 8] = [1, 0, -1, 0, 1, -1, -1, 1];

fn run(args: &Vec<String>) -> Vec<String> {
    let a: Vec<u32> = args[2..].iter().map(|s| s.parse::<u32>().unwrap()).collect();
    let r = a.iter().max().unwrap() - a.iter().min().unwrap();
    vec!(r.to_string())
}


use std::io;
use std::io::BufReader;
fn main() {
    let args = lines(BufReader::new(io::stdin()));
    for line in run(&args) {
        println!("{}", line);
    }
}

use std::io::prelude::*;
fn lines<R: Read>(reader: BufReader<R>) -> Vec<String> {
    reader.lines().map(|l| l.unwrap()).collect()
}