#include <fstream>

using namespace std;

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

int n,k,stiva[16001];

bool verificat(int cap)
{
    int nr=1,s=0;
    for(int i=0; i<n; i++)
    {
        if(s+stiva[i]>cap)
        {
            nr++;
            s=stiva[i];
        }
        else s=s+stiva[i];
    }
    if(nr>k) return false;
    return true;
}

int cautcap(int cap)
{
    int r = 0, pas = 1 << 27;
    while (pas != 0)
    {
        if (r + pas < cap || !verificat(r + pas))
        {
            r += pas;
        }
        pas /= 2;
    }
    r++;
    return r;
}

int main()
{
    int cap=0;
    in>>n>>k;
    for(int i=0; i<n; i++)
    {
        in>>stiva[i];
        if(stiva[i]>cap) cap=stiva[i];
    }
    out<<cautcap(cap);
    return 0;
}