#include <bits/stdc++.h>
using namespace std;
const long long MOD1 = 1000000007;
const long long MOD2 = 998244353;
typedef long long ll;
//typedef int ll;
typedef pair<ll, ll> P;
const long long INF = 1e9;
template <typename T>
void input_arr(vector<T>& A, ll N) {
	for (ll i = 0; i < N; i++) {
		cin >> A[i];
	}
}
template <typename T, typename Q>
void input_arr(vector<pair<T, Q>>& A, ll N) {
	for (ll i = 0; i < N; i++) {
		cin >> A[i].first >> A[i].second;
	}
}
template <typename T>
void input_arr(vector<vector<T>>& A, ll H, ll W) {
	for (ll i = 0; i < H; i++) {
		for (ll j = 0; j < W; j++) {
			cin >> A[i][j];
		}
	}
}
vector<P> prime_factorization(ll N) {
    vector<P>A;
    ll tmp = N;
    for (ll i = 2; i * i <= N; i++) {
        if (tmp % i == 0) {
            A.push_back({ i, 0 });
            while (tmp % i == 0) {
                A.back().second++;
                tmp /= i;
            }
        }
    }
    if (tmp != 1) A.push_back({ tmp, 1 });
    return A;
}
int main() {
    ll N, M; cin >> N >> M;
    vector<ll>A(N); input_arr(A, N);
    ll ans = INF;
    ll sum = 0;
    for (ll i = 0; i < N; i++) {
        sum += A[i];
        ans = min(ans, sum / (M * (i + 1)));
    }
    cout << ans << endl;
}