/*
 * Lefter Sergiu - 16/02/2024
 */
#include <fstream>

using namespace std;

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

const int N = 16000;
const int VMAX = 16000;

int v[N];

bool incap(int v[], int n, int t, int cap) {
    int cap_c = 0, nr_t = 0;
    for (int i = 0; i < n; i++) {
        if (v[i] > cap) {
            return false;
        }
        if (v[i] > cap_c) {
            nr_t++;
            cap_c = cap;
        }
        cap_c -= v[i];
    }
    return (nr_t <= t);
}

int caut_bin(int v[], int n, int t) {
    int st = 1, dr = N * VMAX, rez = dr + 1;
    while (st <= dr) {
        int m = (st + dr) / 2;
        if (incap(v, n, t, m)) {
            rez = m;
            dr = m - 1;
        } else {
            st = m + 1;
        }
    }
    return rez;
}

int main() {
    int n, t;
    in >> n >> t;
    for (int i = 0; i < n; i++) {
        in >> v[i];
    }
    out << caut_bin(v, n, t);
    in.close();
    out.close();
    return 0;
}