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

using namespace std;
int main() {

  int N,K;
  cin >> N >> K;
  vector<float> v;
  for (int i = 0; i < N; i++) {
    float a;
    cin >> a;
    v.push_back(a);
  }
  sort(v.begin(),v.end());
  float max = v.back();
  float min = v.front();
  float dif = max - min;
  cout << dif << "\n";



  return 0;
}