#include <iostream>
#include <algorithm>
#include <functional>
#include <string>
#include <limits.h>
using namespace std;

int main(){
	int n,k;
	int min = 1001;
	int max = 0;
	int in;
	cin >> n >> k;
	
	for(int i=0; i<n; i++){
		cin >> in;
		if(in > max){
			max = in;
		}
		if(in < min){
			min = in;
		}
	}
	
	cout << max - min << endl;
	
	return 0;
}