#include <iostream>

using namespace std;

int main()
{
    int n, k, x, total = 0, divt = 0;
    cin >> n >> k;
    for(int i = 0; i < n; i++)
    {
        cin >> x;
        total += x;
        divt += x/k;
    }
    if(divt * (k+1) > total)
    {
        cout << total/(k+1);
    }
    else
    {
        cout << divt;
    }

    return 0;
}