#include <algorithm>
#include <iostream>
#include <string>

using namespace::std;

int main(void){
	
	int N,K;
	cin >> N >> K;
	int num[10];
	for(int i=0;i<N;++i){
		cin >> num[i];
	}
	int min = 1001;
	int max = 0;
	for(int i=0; i<N; ++i){
		if(num[i] < min){
			min = num[i];
		}
		if(num[i] > max){
			max = num[i];
		}
	}
	cout << max-min << endl;
	return 0;
}