#include <fstream>

using namespace std;

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

const int CMAX = 256000;
const int NMAX = 16000;

int a[NMAX], N, k;

bool se_poate(int c)
{
    int cc=0, nrt=0;
    for(int i=0; i<N; i++)
    {
        if(a[i]>cc)
        {
            cc=c;
            nrt++;
        }
        if(a[i]>cc)
            return false;
        cc -= a[i];
    }
    return (nrt<=k);
}

int caut_bin(int a[])
{
    int rez;
    int st=1, dr=CMAX;
    while(st<=dr)
    {
        int mid=(st+dr)/2;
        if(se_poate(mid))
        {
            rez=mid;
            dr=mid-1;
        }
        else
        {
            st=mid+1;
        }
    }
    return rez;
}

int main()
{
    in >> N >> k;
    for(int i=0; i<N; i++)
        in >> a[i];
    out << caut_bin(a);
    in.close();
    out.close();
    return 0;
}