#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define ALL(v) v.begin(),v.end()
typedef long long ll;
 
#include<bits/stdc++.h>
using namespace std;
 
int main(){
  ios::sync_with_stdio(false);
  std::cin.tie(nullptr);
  
  ll n,m;
  cin>>n>>m;
  vector<ll> A(n);
  rep(i,n) cin>>A[i];
  
  auto f=[&](ll x){
    ll res=0;
    rep(i,n){
      if(A[i]>x*m) res+=A[i]-x*m;
      else if(A[i]<x*m) res-=x*m-A[i];
      if(res<0) return false;
    }
    return true;
  };
  
  ll ok=0,ng=1e9+7;
  while(ng-ok>1){
    ll mid=(ok+ng)/2;
    if(f(mid)) ok=mid;
    else ng=mid;
  }
  cout<<ok<<endl;
  
  return 0;
}