#include <bits/stdc++.h>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");

int n, k, v[16001], maxi;

bool Verificare(int val)
{
    int s=v[1], ct=1;
    for(int i=2; i<=n; i++)
    {
        if(s+v[i] <= val)
            s += v[i];
        else s=v[i], ct++;
    }
    if(ct<=k)
        return 1;
    return 0;
}

int CB()
{
    int st, dr, mij, capacitate;
    st = maxi;
    dr = 16000;
    while(st<=dr)
    {
        mij = (st+dr)/2;
        if(Verificare(mij))
        {
            capacitate = mij;
            dr = mij-1;
        }
        else st = mij+1;
    }
    fout << capacitate;
}

int main()
{
    fin >> n >> k;
    for(int i=1; i<=n; i++)
    {
        fin >> v[i];
        if(v[i] > maxi)
            maxi = v[i];
    }

    CB();
    return 0;
}