#include<iostream>
#include<algorithm>


using namespace std;

int main(){

	int N,K;

	cin >> N >> K;
	int high = 0;
	int low = 1000;
	int n;
	for (int i = 0; i < N; i++){
		cin >>n;
		high = max(high,n);
		low = min(low,n);
	}
	int ans = high -low;

	cout << ans <<endl;
	return 0;
}