#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int v[16014];
int i,mij,k,n,st,dr,tr,s,mini;
int main()
{
    fin>>n>>k;
    s=0;
    for(i=1;i<=n;i++)
        {
            fin>>v[i];
            s=s+v[i];
        }
    st=1;
    dr=s;
    while(st<=dr)
    {
        s=0;
        tr=0;
        mij=st+(dr-st)/2;
        for(i=1;i<=n;i++)
        {
            s=s+v[i];
            if(v[i]>mij)
                {
                    tr=k+1;
                    break;
                }
            if(s+v[i+1]>mij)
                {
                    tr++;
                    s=0;
                }
        }
        tr++;
        if(tr<=k)
            {
                mini=mij;
                dr=mij-1;
            }
        else
            st=mij+1;
    }
    fout<<mini;

    return 0;
}