#include<iostream>
#include<fstream>
#include<sstream>
#include<string>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<ctime>
#include<stack>
#include<queue>
#include<set>
#include<map>
#include<vector>
#include<list>
#include<algorithm>
#include<utility>
#include<complex>
#include<functional>
using namespace std;


int main(void){
	int N; 
	int K;
	int H=0, L=1000;
	cin >> N >> K;
	for (int i = 0; i < N; i++){
		cin >> K;
		H = max(H, K);
		L = min(L, K);
	}
	cout << H-L << endl;
	return 0;
}