#include <iostream>
#include <fstream>
using namespace std;

ifstream fin("transport.in");
ofstream fout("transport.out");

int n, k, a[16004], sum, maxi;

void Read()
{
    fin >> n >> k;
    for(int i=1; i<=n; i++)
        fin >> a[i];
    for(int i=1; i<=n; i++)
        sum += a[i], maxi = max(a[i], maxi);
}

int Cautbin()
{
    int mij, st, dr, nr, cnt,i, vol = 0;
    st = 1;
    dr = 16000;
    while(st <= dr)
    {
        mij = (st + dr)/2;

        if((mij*k)-sum >= 0) dr = mij - 1, vol = mij;
        else st = mij + 1;
    }

    if(vol+1 < maxi) return maxi;
    return vol+1;
}

int main()
{
    Read();
    fout << Cautbin();


    return 0;
}