#include <fstream>

using namespace std;
ifstream in("transport.in");
ofstream out("transport.out");
int v[17000];
int main()
{
    int n,k,i,sol,l,tr,st,dr,ok=0,mij,m=-1,s=0;
    in>>n>>k;
    for(i=1;i<=n;i++)
      {
          in>>v[i];
          s+=v[i];
          if(v[i]>m)
            m=v[i];
      }
    st=m;
    dr=s;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        tr=1;
        l=0;
        for(i=1;i<=n;i++)
        {
            if(l+v[i]<=mij)
              l+=v[i];
            else
            {
                tr++;
                l=v[i];
            }
        }
        if(tr>k)
        {
            st=mij+1;
        }
        else
        {
            sol=mij;
            dr=mij-1;
        }
    }
    out<<sol;
    return 0;
}