#include<iostream>
using namespace std;
int main(){
	int n, ni, k, max = 0, min = 1001;
	cin >> n >> k;
	for (int i = 0; i < n; i++){
		cin >> ni;
		if (ni > max) max = ni;
		if (ni < min) min = ni;
	}
	cout << max - min << endl;
	return 0;
}