#include <bits/stdc++.h>
#define rep(i, n) for(long long i = 0; i < n; i++)
#define ALL(v) (v).begin(), (v).end()
using namespace std;

using lint = long long;

int main() {
    int n, k;
    cin >> n >> k;
    vector<int> a(n);
    rep(i, n) {
        cin >> a[i];
    }
    cout << *max_element(ALL(a)) - *min_element(ALL(a)) << endl;
}