/*
http://www.infoarena.ro/problema/transport
*/

#include <cstdio>
#include <algorithm>
using namespace std;
const int N_MAX = 16000;

int trucks(int *v, int v_len, int c) {
    int s = 0, t = 1;
    for (int i = 0; i < v_len; i++) {
        if (v[i] > c) return -1;
        if (s + v[i] > c) {
            s = v[i];
            t++;
        } else {
            s += v[i];
        }
    }

    return t;
}

int main() {
    freopen("transport.in", "r", stdin);
    freopen("transport.out", "w", stdout);

    int N, K;
    scanf("%d%d", &N, &K);

    int v[N_MAX], total = 0;
    for (int i = 0; i < N; i++) {
        scanf("%d", &v[i]);
        total += v[i];
    }

    int step = 1 << 30, pos = 0;
    int final = total;
    while (step >>= 1) {
        int sum = 0, trucks = 0;

        for (int i = 0; i < N; i++) {
            if (pos + step < K) {
                pos += step;
                goto CONTINUE;
            }
        }

        for (int i = 0; i < N; i++) {
            if (sum + v[i] > pos + step) {
                sum = v[i];
                trucks++;
            } else {
                sum += v[i];
            }
        }

        CONTINUE:
        if (trucks + 1 > K) {
            pos += step;
        }
    }

    printf("%d\n", pos + 1);

    return 0;
}