#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>

using namespace std;


int main() {
  std::cin.tie(0);
  std::ios::sync_with_stdio(false);


  int N, K;
  cin >> N >> K;
  int vmax = -1;
  int vmin = 100000;

  for(int i=0;i<N;i++){
    int v;
    cin >> v;
    vmax = max(vmax, v);
    vmin = min(vmin, v);
  }

  cout << vmax - vmin << endl;

  return 0;
}