// UUID: 9ff8cd46-0eaa-4a6c-a2d4-b7cedde9d1f4
#include <bits/stdc++.h>
using namespace std;


int main() {
   long long N=0;
   cin >> N;
   long long X=0;
   cin >> X;


   long long FINAL=0;
   long long PotionBase=0;
   long long PotionExtra=0;


   vector<long long>A(N);
   for (long long i=0; i<N; i++) {
       cin >> A[i];
       //Reading in the input
       PotionBase+=A[i]%X;
       //Remaining part, which can not be grouped to size X packeges of the same ingredient
       PotionExtra+=(A[i]-(A[i]%X))/X;
       //These are size Xpackeges of the same ingredient (Possibly will be disassembled to PotionBases)
   }


   for (long long i=0; i!=1;) {
       if (PotionBase<PotionExtra) {
           FINAL+=PotionBase;
           PotionExtra-=PotionBase;
           PotionBase=0;


           //Disassemlbing size X PotionExtras to X number of PotionBases
           PotionExtra-=1;
           PotionBase+=X;
       } else {
           FINAL+=PotionExtra;
           PotionBase-=PotionExtra;
           PotionExtra=0;
           //Cycle suicide switch (it ends itself... so sad)
           i=1;
       }
   }


   cout << FINAL;
}