#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
using ll = long long;
using namespace std;
const int INF = 1e9;

int main() {
    int n, k;
    cin >> n >> k;
    vector<int> a(n);
    rep(i, n) cin >> a[i];

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

    cout << a[n - 1] - a[0] << endl;

    return 0;
}