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

int main(){
  int N, K, num;
  int minnum = 0, maxnum = 1000;
  cin >> N >> K;
  for(int i = 0; i < N; i++){
    cin >> num;
    minnum = min(minnum, num);
    maxnum = max(maxnum, num);
  }
  cout << maxnum - minnum << endl;
}