#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;
int main() {
	int n, k;
	cin >> n >> k;
	vector<int> x(n);
	for (int i = 0; i < n; i++) {
		cin >> x[i];
	}
	sort(x.begin(), x.end());
	cout << x[n - 1] - x[0] << endl;
}