#include<bits/stdc++.h>
using namespace std;

int main(){
	int n, k;
	cin >> n >> k;
	int min = 1000;
	int max = 0;
	int a;
	for(int i = 0; i < n; i++){
		cin >> a;
		if(a < min)min = a;
		if(a > max)max = a;
	}
	int ans = abs(max - min);
	cout << ans << endl;
}