#include <iostream>
#include <fstream>

using namespace std;

int v[16005],n,k;

bool sepoate(int c)
{
    int cc=c,nr=1;
    for (int i=1;i<=n;i++)
    {
        if (v[i]>c) return false;
        if (v[i]>cc)
        {
            nr++;
            cc=c;
        }
        cc-=v[i];
        if (nr>k)
        {
            return false;
        }
    }
    return true;
}

int main()
{
    ifstream in("transport.in");
    ofstream out("transport.out");
    in>>n>>k;
    v[0]=0;
    for (int i=1;i<=n;i++)
    {
        in>>v[i];
    }
    int r,pas;
    r=0;
    pas=1<<14;
    while (pas!=0)
    {
        if (sepoate(pas+r)==false)
        {
            r+=pas;
        }
        pas/=2;
    }
    r++;
    out<<r;
    in.close();
    out.close();
    return 0;
}