#include<iostream>
#include<string>
#include<algorithm>
#include<utility>
using namespace std;
int main(void){
	int n,k,*w;
	cin>>n>>k;
	w=new int[n];
	for(int i=0;i<n;i++)cin>>w[i];
	sort(w,w+n);
	cout<<w[n-1]-w[0]<<endl;
}