#include<bits/stdc++.h>
using namespace std;
int main() {
    int M;
    cin >> M;
    vector<int> numbers(M);
    for (int i = 0; i < M; ++i) {
        cin >> numbers[i];
    }
    int a = *max_element(numbers.begin(), numbers.end());
    int b = *min_element(numbers.begin(), numbers.end());
    int c = a - b;
    cout << c << endl;
    return 0;
}