#include <iostream>
#include <vector>
#define rep(i, l, n) for (int i = (l); i < (n); i++)
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 = 0;
	rep(i, 0, n) {
		s += a[i];
	}
	
	ll ans = 0;
	ll t = 0;
	ll flag = true;
	if (s / n >= 500000000) {
		ans = 1000000000;
		while(true) {
			s = t = 0;
			flag = true;
			rep(j, 0, n) {
				s += a[j];
				t += m * ans;
				if (s < t) {
					flag = false;
					break;
				}
			}
			if (flag) {
				break;
			}
			ans--;
		}
	}
	else {
		while (true) {
			flag = false;
			s = t = 0;
			rep(i, 0, n) {
				s += a[i];
				t += m * ans;
				if (s < t) {
					flag = true;
					break;
				}
			}
			if (flag) {
				ans--;
				break;
			}
			ans++;
		}
	}

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