#include <algorithm>
#include <iostream>
#include <map>
#include <numeric>
#include <set>
#include <sstream>
#include <string>
#include <vector>
#include <cmath>
#include <stack>
using namespace std;

int main() {
	int N,K;
	cin >> N >> K;

	int min = 1001;
	int max = 0;

	for (int i = 0;i<N;i++){
		int ai;
		cin >> ai;
		if (ai <= min){
			min = ai;
		}
		if (ai >= max){
			max = ai;
		}
	}
	cout << max-min << endl;
	return 0;
}