#include <iostream>
#include <algorithm>

using namespace std;

int main(void) {
	int N = 0, K = 0;
	int n[9] = {0};
	int ans = 0;

	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;
}