#include <vector>
#include <string>
#include <algorithm>
#include <numeric>
#include <iostream>
#include <cstdlib>
#include <cstring>
#include <utility>
#include <list>
#include <map>
#include <queue>
#include <iterator>
#include <cmath>
#include <iomanip>
using namespace std;

using ull = unsigned long long;
using ll = long long;

int main()
{
    int n,k;
    cin >> n >> k;
    vector<int> nums(n);
    for(auto&& x : nums)    cin >> x;

    sort(nums.begin(),nums.end());

    double min_avr = nums.at(0);
    double max_avr = nums.at(nums.size()-1);

    cout << ceil(max_avr - min_avr) << endl;

}