#include <iostream>
#include <algorithm>
#define N_MAX 9
using namespace std;

int main()
{
	int N, K, n[N_MAX];

	cin >> N >> K;
	for (int i = 0; i < N; ++i)
		cin >> n[i];

	sort(n, n + N);

	cout << n[N - 1] - n[0] << endl;

	return 0;
}