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

int main() {
  int n, k;
  cin >> n >> k;
  int a[n];
  for (auto& i : a) cin >> i;
  int max = *max_element(a, a + n);
  int min = *min_element(a, a + n);
  cout << max - min << endl;
  return 0;
}