#include <fstream>
#include <iostream>

using namespace std;

ifstream f("transport.in");
ofstream g("transport.out");

int n, k;
int s, v[16001];

void citire()
{
    f >> n >> k;
    for(int i = 1; i <=n; ++ i)
    {
        f >> v[i];
        s += v[i];
    }
}

int verif(int x)
{
    int t = 1;
    int c = 0;

    for(int i = 1; i <= n; ++ i)
    {
        if(v[i] > x)
            return 0;
        
        if(c + v[i] > x)
        {
            t ++;
            c = v[i];
        }
        else
        {
            c += v[i];
        }

        if(t > k)
            return 0;
    }
    return 1;
}

int cautBin(int st, int dr)
{
    int mid;
    int cap = 0;
    while(st <= dr)
    {
        mid = (st + dr) / 2;
        if(verif(mid) == 1)
        {
            cap = mid;
            dr = mid - 1;
        }
        else
        {
            st = mid + 1;
        }
    }
    return cap;
}

int main()
{
    citire();

    g << cautBin(1, s);
    
    f.close();
    g.close();
    return 0;
}


//R: 8

/*
6 3
7  3  2  3  1  4
7 10 12 15 16 20


*/