#include <bits/stdc++.h>
using namespace std;

#define dump(x) cout << (x) << '\n'
#define Int int64_t
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()

Int INF = 1e18;
int inf = 1e9;
Int mod = 1e9+7;

int main() {
    Int n, k;
    cin >> n >> k;
    vector<Int> a(n);
    for (Int i = 0; i < n; i++) {
        cin >> a[i];
    }
    sort(all(a));
    dump(a.back() - a.front());
    return 0;
}