#include<fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n,k,v[16001],st,dr,mij,aux;
bool verif(int mij)
{
    int nrtrans=1; int sum=v[1];
    for(int i=2;i<=n;i++)
    {
        if(sum+v[i]>mij)
        {
            nrtrans++;
            sum=v[i];
        }
        else
            sum=sum+v[i];
    }
    if(nrtrans>k)
        return 0;
    return 1;
}
int main()
{
    fin>>n>>k;
    for(int i=1;i<=n;i++)
    {
        fin>>v[i];
        if(v[i]>st) st=v[i];
        dr=dr+v[i];
    }
    while(st<=dr)
    {
        mij=(st+dr)/2;
        if(verif(mij)==1)
        {
            aux=mij;
            dr=mij-1;
        }
        else
            st=mij+1;
    }
    fout<<aux;
}