#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <stack>
#include <algorithm>
#include <string>
#include <map>
#include <iterator>
#include <set>
#include <queue>

using namespace std;


int main() {

    int N, K;
    cin >> N >> K;
    vector<int> ns;
    for (int i = 0; i < N; ++i) {
        int n;
        cin >> n;
        ns.push_back(n);
    }

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

    cout << ns[N - 1] - ns[0] << endl;

    return 0;

}