#include <iostream>		//cin, cout
#include <vector>		//vector
#include <algorithm>	//sort,min,max,count
#include <string>		//string,getline, to_string
#include <cstdlib>		//abs(int)
#include <utility>		//swap, pair
#include <deque>		//deque
#include <climits>		//INT_MAX
#include <bitset>		//bitset

using namespace std;

int main() {

	int N, K;
	cin >> N >> K;

	int max = 0;
	int min = INT_MAX;
	int temp;

	for (int i = 0; i < N; i++) {
		cin >> temp;
		if (temp < min) {
			min = temp;
		}
		if (temp > max) {
			max = temp;
		}
	}

	cout << max - min << endl;

	return 0;

}