#include <iostream>
#include <algorithm>
using namespace std;

int main(void){
  int num,k,arr[9],maxAve,minAve;
  double dif;
  cin >> num >> k;
  for(int i = 0; i < num; i++)cin >> arr[i];
  sort(arr,arr + num);
  //for(int i = 0; i < num; i++)cout << arr[i] << ' ';
  cout << arr[num - 1] - arr[0] << endl;
  return 0;
}