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

int main() {
	int N, k;
	cin >> N >> k;
	vector<int> n(N);
	for (auto &x : n) cin >> x;
	cout << *max_element(n.begin(), n.end()) - *min_element(n.begin(), n.end()) << endl;
}