#include <fstream>

using namespace std;

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

int k, n;
int v[16010];

bool propr(int val) {
    int c = 0, nr = 0;
    for (int i = 0; i < n; ++i) {
        if (v[i] > val) {
            return false;
        }
        if (c < v[i]) {
            c = val;
            ++nr;
        }
        c -= v[i];
        if (nr > k) {
            return false;
        }
    }

    return true;
}

int cb() {
    int r = 0, pas = 1<<29;
    while (pas != 0) {
        if (!propr(r + pas)) {
            r += pas;
        }
        pas>>=1;
    }
    return r;
}

int main()
{
    cin >> n >> k;
    for (int i = 0; i < n; ++i) {
        cin >> v[i];
    }
    cout << cb() + 1;
    return 0;
}