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