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

int main(int argc, char** argv) {
	cin.tie(0);
	ios::sync_with_stdio(false);

	int n, k;
	cin >> n >> k;
	vector<int> v(n);
	for (int i = 0; i < n; i++) {
		cin >> v[i];
	}
	cout << *max_element(v.begin(), v.end()) - *min_element(v.begin(), v.end()) << endl;

	return 0;
}