#include <bits/stdc++.h>
#define DAU  ios::sync_with_stdio(false); fin.tie(0); fout.tie(0);
#define PLEC fin.close(); fout.close(); return 0;
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n, k, v[20000], st, dr(4e8), mid, res;
inline bool Check(int x)
{
    int t(0), cnt(0);
    for (int i = 1; i <= n; ++i)
    {
        if (t + v[i] > x)
            t = 0, ++cnt;
        t += v[i];
    }
    if (t) ++cnt;
    return (cnt <= k);
}
int main()
{
    DAU
    fin >> n >> k;
    for (int i = 1; i <= n; ++i)
        fin >> v[i], st = max(st, v[i]);
    while (st <= dr)
    {
        mid = (st + dr) / 2;
        if (Check(mid))
            res = mid, dr = mid - 1;
        else st = mid + 1;
    }
    fout << res;
    PLEC
}