#include <fstream>

using namespace std;
const int NMAX=16005;
int v[NMAX];
int main()
{
    ifstream fin ("transport.in");
    ofstream fout ("transport.out");
    int n,k,i,total=0,st=0,dr,med,last=0,s=0;
    fin>>n>>k;
    for(i=1; i<=n; i++)
    {
        fin>>v[i];
        total=total+v[i];
    }
    dr=total;
    while(st<=dr)
    {
        s=0;
        med=(st+dr)/2;
        int tr=0;
        for(i=1; i<=n; i++)
        {
            if(v[i]>med)
            {
                tr=k+1;
                break;
            }

            if(s+v[i]<=med)
                s=s+v[i];
            else
            {
                tr++;
                s=v[i];
            }
        }//for
        if(s<=med)
            tr++;
        if(tr<=k)
        {
            last=med;
            dr=med-1;
        }
        else
            st=med+1;
    }//while
fout<<last;
fin.close();
fout.close();
    return 0;
}