#include <bits/stdc++.h>

using namespace std;

int main() {
    int M;
    cin >> M;
    int max = INT32_MIN, min = INT32_MAX;
    for (int i = 0; i < M; ++i) {
        int c;
        cin >> c;
        if (c > max)max = c;
        if (c < min)min = c;
    }
    cout << max - min << endl;
    return 0;
}