#include <bits/stdc++.h>

using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n, k, v[16005], st, dr;

int nrtransporturi(int c)
{
    int nr=0, rez=1;
    for(int i=1; i<=n; i++)
    {
        ///vrem sa bagam o saltea in camion si verificam daca se poate
        if(nr+v[i]<=c)
        {
            nr+=v[i];
        }
        else
        {
            rez++;
            nr=v[i];
        }
    }
    return rez;
}
int minim=16001;
int main()
{
    fin>>n>>k;
    for(int i=1; i<=n; i++)
    {
        fin>>v[i];
        dr+=v[i];
        st=max(st, v[i]);
    }
    while(st<=dr)
    {
        int mid=(st+dr)/2;
        if(nrtransporturi(mid)<=k)
        {
            dr=mid-1;
        }
        else
        {
            st=mid+1;
        }
    }
    fout<<st;
    return 0;
}