#include <stdio.h>
#include <algorithm>
#include <iostream>
#include <string>
#include <vector>
#include <functional>
#include <map>
#include <iomanip>
#include <math.h> 
#include <stack>
#include <queue>
#include <bitset>
#include <cstdlib>
#include <tuple>
#include <cctype>
#include <ctype.h>
#include <set>
#include <sstream>

using namespace std;


int main(){
	int i, j, k;
	int n;


	cin >> n >> k;

	int maxn = 0 , minn = 99999999;

	for (i = 0; i < n; i++) {
		int num;
		cin >> num;
		maxn = max(maxn, num);
		minn = min(minn, num);
	}

	cout << maxn - minn << endl;




	getchar();
	getchar();
	return 0;
}