#include "bits/stdc++.h"
using namespace std;



int main() {
	int N;
	int K;
	cin >> N >> K;
	vector<int> v(N);
	for (int i = 0; i < N; i++)
	{
		cin >> v[i];
	}
	int ans = 0;
	for (int i = 0; i < N; i++)
	{
		for (int j = 0; j < N; j++)
		{
			ans = max(ans, abs(v[i] - v[j]));
		}
	}
	cout << ans << endl;
}