#include <algorithm>
#include <iostream>
#include <string>
#include <vector>
#define REP(i,n) for (int i=0;i<(n);i++)

using namespace std;

int main(){
	vector<int> vec;
	int N, K, tmp;
	cin >> N >> K;
	
	
	REP(i, N){
		cin >> tmp;
		vec.push_back(tmp);
	}
	
	sort(vec.begin(), vec.end());


	cout << vec[vec.size() - 1] - vec[0] << endl;
	return 0;
}