import * as fs from 'node:fs';

const input = fs.readFileSync('/dev/stdin', 'utf8').trim().split(/\s+/);
let index = 0;

const N = parseInt(input[index++]);
const K = parseInt(input[index++]);
const n: number[] = [];

for (let i = 0; i < N; i++) {
    n.push(parseInt(input[index++]));
}

// Direct calculation without function
const min = Math.min(...n);
const max = Math.max(...n);
const result = max - min;

console.log(result);