#include <bits/stdc++.h>

using namespace std;

int main()
{
  int N, K;
  cin >> N >> K;

  int small = 10000, big = 0;
  for(int i = 0; i < N; i++) {
    int A;
    cin >> A;
    small = min(small, A);
    big = max(big, A);
  }
  cout << big - small << endl;
}