#include <map>
#include <set>
#include <list>
#include <cmath>
#include <ctime>
#include <deque>
#include <queue>
#include <stack>
#include <string>
#include <bitset>
#include <cstdio>
#include <limits>
#include <vector>
#include <climits>
#include <cstring>
#include <cstdlib>
#include <fstream>
#include <numeric>
#include <sstream>
#include <iostream>
#include <algorithm>
#include <iomanip>
using namespace std;

int main()
{
	int n, k, a;
	vector<int>v;
	cin >> n >> k;
	for (int i = 0; i < n; i++)
	{
		cin >> a;
		v.push_back(a);
	}
	sort(v.begin(), v.end());
	cout << v[n - 1] - v[0] << endl;
	return 0;
}