#include <iostream>
using namespace std;
int main() {
    int n;
    cin >> n;
    int a;
    int b = -200000;
    int c = 200000;
    for (int i = 1; i <= n; i++) {
        cin >> a;
        if (a > b )b = a;
        if (a < c) c = a;
    }
    cout << b - c << endl;
    return 0;
}