#include <iostream>
#include <fstream>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
int n,nrt,p,m,s,i,x;
int main()
{f>>n>>nrt;
    for(i=1;i<=n;i++)
        {f>>x;
        s=s+x;
        }
g<<s/nrt+n/nrt;

    return 0;
}