#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n,v[801],s,k;
int main()
{
    fin>>n>>k;
    for(int i=1;i<=n;i++){
        fin>>v[i];
        s+=v[i];
    }
    fout<<s/k+1;
    return 0;
}