#include <bits/stdc++.h>
using namespace std;

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  
  int n, k;
  cin >> n >> k;
  
  int upper = 0, lower = 1e9;
  for (int i = 0; i < n; i++) {
    int x;
    cin >> x;
    upper = max(upper, x);
    lower = min(lower, x);
  }
  
  cout << upper - lower << '\n';
}