#include <bits/stdc++.h>
#define rep(i, a, n) for (int i = a; i < n; i++)
#define repr(i, a, n) for (int i = n - 1; i >= a; i--)
using namespace std;
using ll = long long;
using P = pair<int, int>;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);

  int n, k;
  cin >> n >> k;
  vector<int> v(n);
  rep(i, 0, n) cin >> v[i];
  int min_val = *min_element(v.begin(), v.end());
  int max_val = *max_element(v.begin(), v.end());
  cout << max_val - min_val << endl;
}