#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int main() {
    int n;
    cin >> n;
    vector<int> v;
    for(int i = 0; i < n; i++)
    {
        int tmp;
        cin >> tmp;
        v.push_back(tmp);
    }
    sort(v.begin(), v.end());
    cout << v[v.size()-1] - v[0] << endl;
}