#include <bits/stdc++.h>

using namespace std;

#define REP(i, n) for(int i = 0; i < n; i++)

int main() {
    int N, K;
    cin >> N >> K;
    int a, minAve = INT_MAX, maxAve = INT_MIN;
    REP(i, N) {
        cin >> a;
        minAve = min(a, minAve);
        maxAve = max(a, maxAve);
    }
    cout << maxAve - minAve << endl;
    return 0;
}