#include <fstream>
using namespace std;
int n, k, v[16005], i;
void citire ()
{
    ifstream in ("transport.in");
    in >> n >> k;
    for (i = 1; i <= n; ++i)
    in >> v[i];
    in.close ();
}
void afis (long long rez)
{
    ofstream out ("transport.out");
    out << rez << '\n';
    out.close ();
}
bool valid (long long m)
{
    int val = m, k1 = k;
    for (i = 1; i <= n && k1; ++i)
    if (v[i] <= val)
    val -= v[i];
    else
    {
        --k1;
        --i;
        val = m;
    }
    if (i == n + 1)
    return 1;
    return 0;
}
int binary (long long inc, long long sf)
{
    long long m;
    while (inc <= sf)
    {
        m = (inc + sf) / 2;
        if (valid (m))
        sf = m - 1;
        else
        inc = m + 1;
    }
    return inc;
}
int main()
{
    long long s;
    citire ();
    for (i = 1; i <= n; ++i)
    s += v[i];
    if (k == 1)
    afis (s);
    else
    afis (binary (1, s * 2));
    return 0;
}