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

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

int n, k, saltele[16001], maxim, s;

void citire()
{
    fin >> n >> k;
    for (int i = 0; i < n; ++i)
    {
        fin >> saltele[i];
        s += saltele[i];
        if (saltele[i] > maxim)
            maxim = saltele[i];
    }
}

bool gasit(int x)
{
    int c = 1, suma = 0;
    for (int i = 0; i < n; ++i)
    {
        suma += saltele[i];
        if (suma > x)
        {
            suma = saltele[i];
            ++c;
        }
    }
    if (c <= k)
        return true;
    return false;
}

int cautare_binara()
{
    int st = maxim, dr = s;
    while (st < dr)
    {
        int m = (st + dr) / 2;
        if (gasit(m))
            dr = m;
        else
            st = m + 1;
    }
    return st;
}

int main()
{
    citire();
    fout << cautare_binara();
    return 0;
}