#include <bits/stdc++.h>
using namespace std;

int main() {
    int N, K, MIN = 1000, MAX = 0;
    cin >> N >> K;
    while (N--) {
        int x;
        cin >> x;
        MIN = min(MIN, x);
        MAX = max(MAX, x);
    }
    cout << MAX - MIN << endl;
}