#include <iostream>
#include <algorithm>

using namespace std;

long long S;
const long long N = 1e5 + 10;
long long arr[N];

int main() {
    cin >> S;

    for (int i = 0 ; i < S ; i++) {
        cin >> arr[i];
    }

    sort(arr , arr + S);//sort排序

    cout << arr[S - 1] - arr[0] << endl;

    return 0;
}