#include <fstream>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");

int n,k,a[20000];

int numar(int t)
{
    int s=0,i,nr=1;
    for (i=0; i<n; i++)
        if (s+a[i]>t)
        {
            s=a[i];
            nr++;
        } else s+=a[i];
    return nr;
}

int capacitatea()
{
    int s=0,i;
    for (i=0; i<n; i++)
        s+=a[i];
    int l=0, r=s, t;
    while (l<r)
    {
        t=(l+r)/2;
        if (numar(t)<=k) r=t; else l=t+1;
    }
    return (l+r)/2;
}

int main()
{
    f >> n >> k;
    for (int i=0; i<n; i++)
        f >> a[i];
    g << capacitatea();
}