#include <iostream>
#include <sstream>
#include <math.h>
#include <stack>
#include <set>
#include <algorithm>
#include <string>
#include <queue>
#include <stack>
#include <map>
#include <cstdio>
#include <vector>
using namespace std;

#define INF (1 << 30)
#define INFLL (1LL << 60)

int main() {
	int n,k;
	cin >> n;
	cin >> k;
	int mi = INF,ma = 0;
	for(int i = 0;i < n;i++){
		cin >> k;
		mi = min(mi,k);
		ma = max(ma,k);
	}
	cout << ma - mi << endl;
	return 0;
}