#include <cstdio>
#include <iostream>
#include <algorithm>

using namespace std;

const int N = 1010;

int a[N];
int n;

int main()
{
    cin >> n;
    for ( int i = 0; i < n; i ++ ) cin >> a[i];
    sort(a, a + n);
    cout << a[n - 1] - a[0];
    return 0;
}