#include <bits/stdc++.h>

using namespace std;

int n, k, a[10002], sum;

inline void Citire()
{
    int i;
    ifstream fin("transport.in");
    fin >> n >> k;
    for(i = 0; i < n; ++i)
    {
        fin >> a[i];
        sum += a[i];
    }
    fin.close();
}

int Verifica(int M)
{
    int i, tr, v;
    tr = 1;
    v = 0;
    for(i = 0; i < n; ++i)
    {
        if(a[i] > M) return 0;
        if(v + a[i] <= M)
            v += a[i];
        else
        {
            tr++;
            v = a[i];
        }

    }
    if(tr > k) return 0;
    return 1;

}

int Solutie()
{
    int st, dr, m, sol;
    st = 1;
    dr = sum;
    while(st <= dr)
    {
        m = (st + dr) / 2;
        if(Verifica(m))
        {
            sol = m;
            dr = m - 1;
        }
        else st = m + 1;
    }
    return sol;
}

int main()
{
    Citire();
    ofstream fout("transport.out");
    fout << Solutie() << "\n";
    fout.close();
    return 0;
}