#include <vector>
#include <queue>
#include <deque>
#include <stack>
#include <algorithm>
#include <functional>
#include <iostream>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <cctype>
#include <string>

using namespace std;

int main() {
  int n, k;
  cin >> n;
  cin >> k;
  int a[n];
  for (int i = 0; i < n; i++) cin >> a[i];
  sort(a, a+n);
  cout << a[n-1]-a[0] << endl;
}