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

int main() {
	int N, K;
	cin >> N >> K;

	vector<int> v(N);
	for (int i = 0; i < N; i++) {
		cin >> v.at(i);
	}

	sort(v.begin(), v.end());
	cout << v.at(v.size() - 1) - v.at(0) << endl;
}