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

int main(void) {
	cin.tie(0);
	ios::sync_with_stdio(false);
	
	int N, K; cin >> N >> K;
	vector<int> n(N);
	for (int i = 0; i < N; ++i) cin >> n[i];
	sort(n.begin(), n.end());
	int avg = n[N - 1] - n[0];
	cout << avg;
	return 0;
}