#include <fstream>

using namespace std;
ifstream cin("transport.in");
ofstream cout("transport.out");
int n, maxx = -1, k;
int v[16005];
int kappa(int x) {
    int s = 0, i, lim = 0;
    for (i = 1; i < n; i++) {
        s += v[i];
        if (v[i + 1] + s > x) {
            s = 0;
            lim++;
        }
    }
    return lim + 1;
}
void verif() {
    int r = 0;
    int pas = 1 << 28;
    while (pas) {
        if (pas + r < maxx || kappa(r + pas) > k)
            r += pas;
        pas = pas / 2;
    }
    cout << r + 1;
}
int main() {
    int maxx1 = -1, j, i;
    cin >> n >> k;
    for (j = 1; j <= n; j++) {
        cin >> v[j];
        if (v[j] > maxx)
            maxx = v[j];
    }
    verif();
    return 0;
}