#include <bits/stdc++.h>
#define rep(i, ss, ee) for (int i = ss; i < ee; ++i)
using namespace std;

int main() {
  int N, K;
  cin >> N >> K;
  vector<int> v(N);
  rep(i, 0, N) { cin >> v[i]; }
  sort(v.begin(), v.end());
  cout << v.back() - v.front() << endl;
  getchar();
}