//#include <bits/stdc++.h> 
#include <iostream>
#include <stdio.h>
#include <math.h>
#include <iomanip>
using namespace std;
const int N = 1e5 + 10;
const int INF = 0x3f3f3f3f;
int n , a , x , d , cha;
int main()
{
	cin >> n;
	for( int i = 1 ; i <= n ; i++ )
	{
		cin >> a;
		if( i == 1 )
		{
			d = a;
			x = a;
			continue;
		}
		if( a < x )
		{
			x = a;
		}
		if( a > d )
		{
			d = a;
		}
	}
	cha = d - x;
	cout << cha; 
    return 0;
}