#include <iostream>
#include <vector>
#include <bits/stdc++.h>



using namespace std;

int main()
{
    int n;
    cin>>n;
    int x;
    cin>>x;
    int m;
    vector <int> menny;
    for(int i=0;i<n;i++){
        cin>>m;
        menny.push_back(m);
    }
    int meg=0;
    int i=0;
    int ism=0;
    sort(menny.begin(),menny.end(),greater<int>());
    while(menny.front()>=x)
    {
        ism=menny.front()/x;
        menny.front()=menny.front()%x;
            for(int m=0;m<ism;m++)
            {
                if(menny.back()==0)
                {
                menny.pop_back();
                }
                menny.back()--;
                meg++;
            }
        sort(menny.begin(),menny.end(),greater<int>());
    }






    cout<<meg;
    return 0;
}