#include <fstream>

using namespace std;

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

int n, k, v[16001];
int sum, maxim;


bool verificare(int m) {
    int s = 0, counter = 0;
    for (int i = 1; i <= n; i++) {
        if (s + v[i] < m)
            s += v[i];
        else {
            counter++;
            s = v[i];
        }
    }
    if (counter <= k)
        return true;
    return false;
}

int main() {
    fin >> n >> k;
    for (int i = 1; i <= n; i++)
        fin >> v[i];
    int st = 1, dr = 1600 * 1600, sol = 0;
    while (st < dr) {
        int mid = (st + dr) / 2;
        if (!verificare(mid))
            st = mid + 1;
        else {
            sol = mid;
            dr = mid;
        }
    }
    fout << sol;
    return 0;
}