#include <iostream>	//cin, cout
#include <vector>	//vector
#include <algorithm> //sort,min,max
#include <string>	//string
#include <ios>		//fixed
#include <iomanip>	//setprecision

using namespace std;

int main() {

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

	int temp = 0;
	int max = 1;
	int min = 1000;

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

	cout << max - min << endl;

	return 0;

}