#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int main()
{
    int N, K;
    cin >> N >> K;
    vector<int> n(N);

    for (int i = 0; i < N; i++)
    {
        cin >> n[i];
    }
    sort(n.begin(), n.end());
    cout << n[N - 1] - n[0] << "\n";
}