#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES
#include <iostream>
#include <map>
#include <list>
#include <cstdio>
#include <cmath>
#include <cstring>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <queue>
#include <iomanip>

using namespace std;



int main(void)
{
	int N, K, n;
	int mi = 10e9;
	int ma = 0;
	int a;

	cin >> N >> K;

	for (int i = 0; i < N; i++) {
		cin >> a;
		mi = min(a, mi);
		ma = max(a, ma);
	}

	cout << ma - mi << endl;

	return (0);
}