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

int main(){
  int n,k;
  cin >> n >> k;
  int a[n];
  for(int i=0;i<n;i++){cin >> a[i];}
  sort(a,a+n);
  cout << a[n-1]-a[0] << endl;
  return 0;
}