#include <iostream>
#include <fstream>

using namespace std;
ofstream g("transport.out");

int N, K, a[16005];

int Div(int x) {
    int secv = 0, i, ct = 0;
    for (i = 1; i <= N; i++) {
        if (a[i] > x) return 0;
        ct += a[i];
        if (ct > x) {
            secv++;
            ct = a[i];
        }
    }
    if (secv <= K) return 1;
    return 0;
}

int Cautare_binara() {
    int st, dr, poz, m;
    st = 1;
    dr = 256000000;
    poz = 0;
    while (st <= dr) {
        m = (st + dr) / 2;
        if (Div(m) == 1) {
            poz = m;
            dr = m - 1;
        } else st = m + 1;
    }
    return poz;
}

int main() {
    int x;
    ifstream f("transport.in");

    f >> N >> K;
    for (int i = 1; i <= N; i++) {
        f >> a[i];
    }
    x = Cautare_binara();
    g << x<<"\n";
    f.close();
    g.close();
    return 0;
}