#include <bits/stdc++.h> using namespace std; using ll = long long; using P = pair<ll,ll>; #define rep(i, n) for(int i = 0; i < n; i++) #define all(x) (x).begin(),(x).end() template<class T>bool chmin(T&a, const T&b){if(a>b){a=b;return 1;}return 0;} template<class T>bool chmax(T&a, const T&b){if(a<b){a=b;return 1;}return 0;} int main(){ ll n, m, tot = 0, ans = 1LL<<60; cin >> n >> m; rep(i,n){ ll a; cin >> a; tot += a; ans = min(ans, tot/(i+1)/m); } cout << ans << endl; return 0; }