#include <iostream>
#include <fstream>

using namespace std;

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

int d,v[16003],maxi,sum,n;

int numara_drumuri(int capca) {
    int nrd=0,s=0;
    for (int i=0; i<n;) {
        ///pregatim un drum
        while (s+v[i]<=capca) {
            s+=v[i]; /// punem o saltea
            i++; /// trecem la urmatoarea saltea
        }
        nrd++;
        s=0;
    }
    return nrd;
}

int main()
{
    int solutie;
    fin>>n>>d;
    for (int i=0; i<n; i++) {
        fin>>v[i];
        if (v[i] > maxi)  {
            maxi=v[i];
        }
        sum+=v[i];
    }
    for (int i=maxi; i<=sum; i++) {
        if (numara_drumuri(i)<=d) {
            solutie=i;
            break;
        }
    }
    fout<<solutie;
    return 0;
}