#include <fstream>

using namespace std;

ifstream fin("cautbin.in");
ofstream fout("cautbin.out");
int n,k,a[16001];

bool valid(int x)
{
    bool ok;
    int s=0,nr=0;
    for (int i=1;i<=n;i++)
    {
        while(s+a[i]<x && i<=n)
        {
            s+=a[i];
            i++;
        } 
        nr++;
       /// fout<<s<<" ";
        s=a[i];
        if (a[i]>=x) return 0;
    }
    if (nr<=k) return 1;
    return 0;
}

int main()
{
    fin>>n>>k;
    for (int i=1;i<=n;++i)
    {
        fin>>a[i];
    }
    int r,rmin=16001;
    int lf=1,rg=16000,mij;
    while (lf<=rg)
    {
        mij=(rg+lf)/2;
        if (valid(mij)==1)
        {
            if (mij<rmin)
                rmin=mij;
            rg=mij-1;
        }
        else if (valid(mij)==0)
        {
            lf=mij+1;
        }
    }
    fout<<rmin;
}