#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <time.h>
#include <cstdlib>
#include <cmath>
#include <fstream>

int main(void) {

	//test用
	//std::ifstream in("test.txt");
	//std::cin.rdbuf(in.rdbuf());

	int N, K;
	std::cin >> N >> K;

	int max = 0;
	int min = 1000;

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

	std::cout << max - min << std::endl;
}