#include <bits/stdc++.h>

using namespace std;

int main() {
    int N, K;
    cin >> N >> K;

    int a, minA = INT_MAX, maxA = INT_MIN;
    for (int i = 0; i < N; ++i) {
        cin >> a;
        minA = min(a, minA);
        maxA = max(a, maxA);
    }

    cout << maxA - minA << endl;
    return 0;
}