#include "bits/stdc++.h"
using namespace std;
 
int main(void) {
	int n;
	cin >> n;
	vector<int> a(n);
	for(int i=0;i<n;i++) cin >> a[i];

	sort(a.begin(), a.end());	

	cout << a[n-1] - a[0] << endl;
}
