#include <bits/stdc++.h>

using namespace std;

ifstream in("transport.in");
ofstream out("transport.out");
#define cin in
#define cout out
#define NMAX 16005

int n, k, vol[NMAX];

bool check_transport(int cap){
    int tr = 1, cur = 0;
    for (int i = 0; i < n; i++) {
        if (vol[i] > cap)
            return false;
        if (cur + vol[i] > cap) {
            tr++;
            cur = vol[i];
        }
        else
            cur += vol[i];
    }
    return tr <= k;
}

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    cin >> n >> k;
    for (int i = 0; i < n; ++i) 
        cin >> vol[i];

    int l = 0, r = NMAX * n + 1;
    while (l < r) {
        int m = (l + r) / 2;
        if (check_transport(m)) {
            r = m;
        }
        else
            l = m + 1;
    }
    cout << l << '\n';

    return 0;
}