#include <bits/stdc++.h>
    using namespace std;
    #include <math.h>
    #include <iomanip>
    #include <cstdint>
    #include <string>
    #include <sstream>
    #include <random>
    template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
    template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
    #define rep(i,n) for (int i = 0; i < (n); ++i)
    typedef long long ll;
    typedef unsigned long long ull;
    using P=pair<ll,ll>;
    const int INF=1001001001;
    const ll INFL=1e18;
    const int mod=1e9+7;
    
    void solve(){
        ll n,m;
        cin>>n>>m;
        vector<int>a(n);
        rep(i,n)cin>>a[i];
        
        vector<ll>sum(n+1);
        rep(i,n)sum[i+1]=sum[i]+a[i];
        
        ll ans=INF;
        for(ll i=1;i<=n;i++){
            chmin(ans,sum[i]/(m*i));
        }
        cout<<ans<<endl;
    }  

    int main(){
        ios_base::sync_with_stdio(false);
        cin.tie(NULL);
        
        solve();  
        
        return 0;
    }