#include <fstream>
using namespace std;
ifstream in("transport.in");
ofstream out("transport.out");
const int N = 16000*16000+10;
int n,k,greutate_totala,gr_max,a[16001],st=1,dr=N,mij,i;
bool check_capacity(int c)
{
    int x=0,transporturi=0;
    for (int i=1; i<=n; ++i)
    {
        x+=a[i];
        if (x>c) transporturi++,x=a[i];
        else if (x==c) transporturi++,x=0;
        if (transporturi>k) return false;
    }
    if (x) transporturi++;
    if (transporturi<=k) return true;
    return false;
}
int main()
{
    in>>n>>k;
    for (i=1; i<=n; ++i)
    {
        in>>a[i];
        greutate_totala+=a[i];
        gr_max=max(gr_max,a[i]);
    }
    if (k==1) out<<greutate_totala<<"\n";
    else if (k>=n) out<<gr_max<<"\n";
    else
    {
        while (st<dr)
        {
            mij=(st+dr)/2;
            if (mij>=gr_max && check_capacity(mij))
                dr=mij;
            else
                st=mij+1;
        }
        out<<dr<<"\n";
    }
}