#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main() {
	int N, K;
	vector<int> v;
	cin >> N >> K;
	for (int i = 0; i < N;i++) {
		int temp; cin >> temp;
		v.push_back(temp);
	}
	sort(v.begin(), v.end());
	cout << v[N - 1] - v[0] << endl;
	return 0;
}