#include <bits/stdc++.h>
using namespace std;
int main()
{
	cin.tie(0);
	ios::sync_with_stdio(false);
	
	int N, K;
	cin >> N >> K;

	vector<int> vc(N);
	for( auto&& x : vc )
	{
		cin >> x;
	}
	auto res = minmax_element( vc.begin(), vc.end() ); //<----- NOT """std::minmax""" !!!!!!!!!!!!!!!!!
	cout << *res.second - *res.first << endl;
	return 0;
}