#include <iostream>
#include <vector>
#define rep(i, l, n) for (int i = (l); i < (n); i++)
#define min(a,b) (((a) < (b)) ? (a) : (b))
using namespace std;
using ll = long long;
template <class T>
using V = vector<T>;


int main(void) {
	ll n, m;	cin >> n >> m;
	V<ll> a(n);
	rep(i, 0, n) {
		cin >> a[i];
	}

	ll s = a[0];
	ll ans = a[0] / m;
	rep(i, 1, n) {
		s += a[i];
		ans = min(ans, s / (m * (i + 1)));
	}

	cout << ans << endl;
	return 0;
}