#include<iostream>
#include<algorithm>
using namespace std;

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

	return 0;
}