#include <fstream>
#include <climits>

using namespace std;

int v[16001];

ifstream fin ("transport.in");
ofstream fout ("transport.out");

int check(int nr,int n)
{
    int camion=nr,parcurgeri=1;
    for(int i=1; i<=n; i++)
    {
        if(camion>=v[i])
        {
            camion-=v[i];
        }
        else if (nr>=v[i])
        {
            parcurgeri++;
            camion=nr-v[i];
        }
        else
        {
            return INT_MAX;
        }
    }
    return parcurgeri;
}
int cautbin(int n,int k,int s)
{
    int st=1,dr=s,lastmed;
    while (st<=dr)
    {
        int med=(st+dr)/2;
        int parcurgerimed=check(med,n);
        if(parcurgerimed>k)
        {
            st=med+1;
        }
        else if (parcurgerimed<=k)
        {
            dr=med-1;
            lastmed=med;
        }
    }
    return lastmed;
}
int main()
{
    int n,k,s=0;
    fin>>n>>k;

    for (int i=1; i<=n; i++)
    {
        fin>>v[i];
        s+=v[i];
    }

    fout << cautbin(n,k,s);
    return 0;
}