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

int main()
{
	int n, k; cin >> n >> k;
	vector<int>num(n);
	for (int i = 0; i < n; i++) {
		cin >> num[i];
	}
	sort(num.begin(), num.end());

	cout << num[num.size() - 1] - num[0] << endl;

    return 0;
}