#include <fstream>

using namespace std;

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

int n,cnt_camion;
int v[16005];

int IsOk(int volum)
{
    int suma=0,cnt=0;
    for(int i=0;i<n;i++)
    {
        if(suma+v[i]<=volum)
        {
            suma+=volum;
        }
        else
        {
            if(v[i]>volum)
            {
                return false;
            }
            else
            {
                suma=v[i];
                cnt++;
            }
            if(cnt>cnt_camion)
            {
                return false;
            }
        }
    }
    if(cnt>cnt_camion)
        return false;
    return true;
}
int main()
{
    //ifstream cin("abx.in");
    //ofstream cout("abx.out");
    int st,dr,mij;
    cin>>n>>cnt_camion;
    for(int i=0;i<n;i++)
    {
        cin>>v[i];
    }
    st=0;
    dr=16000*16000;
    while(st<dr)
    {
        mij=(st+dr)/2;
        ///cout<<"mij="<<mij<<"\n";
        if(IsOk(mij)==true)
        {
            dr=mij;
        }
        else
        {
            st=mij+1;
        }
    }
    cout<<st+1;
    return 0;
}