#include "bits/stdc++.h"
using namespace std;

int main() {
	int N, K, n[9];
	cin >> N >> K;
	for (int i = 0; i < N; i++) {
		cin >> n[i];
	}
	sort(n, n + N);
	cout << n[N - 1] - n[0] << endl;
}