#include <bits/stdc++.h> 

using namespace std;

int main() {
    int N, K; cin >> N >> K;
    vector<int> x(N);
    for (int i = 0; i < N; i++) { cin >> x[i]; }
    sort(begin(x), end(x));
    cout << x[N - 1] - x[0] << endl;
}