#include<iostream>
using namespace std;

int main(){
  int n,k;
  cin >>n>>k;

  int a[n], i;
  for(i=0;i<n;i++)
    cin >> a[i];
    
  int j, tmp;
  for(i=0;i<n-1;i++){
    for(j=n-1;j>i;j--){
      if(a[i]>a[j]){
	tmp = a[i];
	a[i] = a[j];
	a[j] = tmp;
      }
    }
  }

  cout << a[n-1]- a[0] << endl;
	
  
  return 0;

}