#include <vector>
#include <algorithm>
#include <fstream>
using namespace std;
ifstream cin("transport.in");
ofstream cout("transport.out");
int main() {
    int  n, k,Suma=0;
    cin >> n >> k;
    vector<int>sir(n);
    for (int i = 0; i < n; i++) {
        cin >> sir[i];
        Suma += sir[i];
    }
    float rezultat = (float)Suma / k;
    Suma = Suma / k;
    if (rezultat == (float)Suma) {
        cout << Suma;
    }
    else {
        cout << Suma + 1;
    }
    return 0;
}