//inlclude前用define 
#define _USE_MATH_DEFINES

//include
#include<iostream>
#include<string>
#include<algorithm>
#include<vector>
#include<cmath>

using namespace std;
//typedef
typedef vector<int> VI;
typedef vector<string> VS;
typedef vector<char> VC;

int main() {
	int n, k;
	cin >> n >> k;
	VI a(n);
	for (int i = 0; i < n; i++) cin >> a[i];
	sort(a.begin(), a.end());
	//int sum = 0,b=(n%k==0)?n/k:(n+k)/k;
	printf("%d", a[n - 1] - a[0]);
	return 0;
}