#include<bits/stdc++.h>
using namespace std;
int main () {
	int n,max = -1e9,min = 1e9;
	cin >> n;
	int a;
	for (int i = 1;i <= n; i++) {
		cin >> a;
		if (max < a) {
			max = a;
		}
		if (min > a) {
			min = a;
		}
	}
	cout <<max - min;
	return 0;
}