#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];
        
        auto f=[&](ll mid){
            ll mn=m*mid,r=0;
            rep(i,n){
                if(a[i]+r<mn){
                    return false;
                }
                if(a[i]<mn){
                    ll need=mn-a[i];
                    r-=need;
                }
                if(a[i]>mid){
                    ll spill=a[i]-mn;
                    r+=spill;
                }
            }
            return true;
        };

        ll l=0,r=INF;
        while(r-l>1){
            ll mid=(l+r)/2;
            if(f(mid)){
                l=mid;
            }
            else{
                r=mid;
            }
        }
        cout<<l<<endl;
    }  

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