#include<vector>
#include<iostream>

using namespace std;

int main()
{
	int N, K;
	cin >> N >> K;

	int max = 0, min = 3000;

	int n;
	for (int i = 0; i < N; i++)
	{
		cin >> n;
		if (n > max)max = n;
		if (n < min)min = n;
	}

	cout << max - min << endl;


}