#include <algorithm>
#include <iostream>

int main() {
    using namespace std;
    int n, k;
    cin >> n >> k;
    int max_val = 0, min_val = 1000;
    while (n--) {
        int val;
        cin >> val;
        max_val = max(max_val, val);
        min_val = min(min_val, val);
    }
    cout << max_val - min_val << endl;
}