#include <fstream>
#include <algorithm>
#include <vector>
#include <iostream>
using namespace std;
ifstream in("transport.in");
ofstream out("transport.out");

vector <int> v;
int n, k;

int ok(int c)
{
    int i, s = 0, tr = 0;
    for(i = 0; i <=n - 1; i++)
    {
        if(v[i] > c)
        {
            return k + 1;
        }
        if(s + v[i] < c)
            s = s + v[i];
        else
        {
            tr++;
            s = v[i];
        }
    }
    if(s > 0)
        tr++;
    return tr;

}
int bsL(int st, int dr)
{
    int med, last = 16001,d;
    while(st <= dr)
    {
        med = (st + dr)>>1;
        d = ok(med);
        if(d <= k)
        {
            if(last >= med)
                last = med;
            dr = med - 1;
        }
        else
            st = med + 1;
    }
    return last;
}
int main()
{
    int x;
    int S = 0;
    in >> n >> k;
    for(int i = 0; i <= n - 1; i++)
    {
        in >> x;
        v.push_back(x);
        S += x;
    }
    sort(v.begin(), v.end());
    out << bsL(0,S);
    return 0;
}






















//hmm