#include <bits/stdc++.h>

inline long nextInt(void) {
  long temp;
  std::cin >> temp;
  return temp;
}

int main() {

  int N, K;
  std::vector<int> v;
  int ans;
  
  std::cin >> N >> K;
  for(int i = 0; i < N; ++i) {
    v.push_back( nextInt() );
  }

  std::sort(v.begin(), v.end());

  ans = v[N-1] - v[0];
  
  std::cout << ans << std::endl;

  return 0;
}