#include <iostream>
#include <fstream>
using namespace std;

int v[16000];

int f(int volum, int n)
{
    int nr_transport=1, suma=0;
    for(int i=0; i<n; i++)
    {
        if(suma+v[i]>volum)
        {
            nr_transport++;
            suma=0;
        }
        suma+=v[i];
    }
    if(suma>volum)
        nr_transport++;
    return nr_transport;
}

int main()
{
    ifstream cin("transport.in");
    ofstream cout("transport.out");
    int n, k, st=0, dr=0;
    cin >> n >> k;
    for(int i=0; i<n; i++)
    {
        cin >> v[i];
        if(v[i]>st) st=v[i];
        dr+=v[i];
    }
    //cout << st << " " << dr << "\n";
    int mij;
    while(st<=dr)
    {
        mij=st+(dr-st)/2;
        if(f(mij, n)<k) {dr=mij;}
        else if(f(mij, n)>=k+1) {st=mij+1;}
        else break;
        //cout << mij << " " << f(mij, n) << "\n";
    }
    cout << mij;

    return 0;
}