#include <iostream>
#include <fstream>

using namespace std;

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

const int L=28, N=16001;
int n, v[N];

bool SePoate(int c, int k)//verif daca toate cele n saltele pot fi transportate in cel mult k camioane de capacitate c
{
    int nrtrans=1, cap=c;
    for(int i=1;i<=n;i++)
    {
        if(v[i]>cap)
        {
            nrtrans++;
            cap=c;
        }
        if(v[i]>cap) return false;
        cap-=v[i];
    }
    return (nrtrans<=k);
}

int CautBin(int k)
{
    int r = 0, pas = 1<<L;
    while(pas!=0)
    {
        if(!SePoate(r+pas, k))
        {

            r+=pas;
        }

        pas/=2;
    }
    return r+1;
}

int main()
{
    int k;
    in >> n >> k;
    for(int i=1;i<=n;i++)
    {
        in >> v[i];
    }
    out << CautBin(k);
    return 0;
}