#include<fstream>
using namespace std;

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

int n, k, m, s, sum, cnt;
int st = -20000, dr;
int v[16001];

bool Check(int m);

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


    dr = sum;
    while ( st <= dr )
    {
        m = (st + dr)/2;
        if ( Check(m))
            dr = m;
        else
            st = m+1;
    }

    os << st;

    is.close();
    os.close();
    return 0;
}

bool Check(int m)
{
    s = 0;
    cnt = 1;
    for ( int i = 1; i <= n; ++i )
    {
        if ( s + v[i] <= m )
            s += v[i];
        else
        {
            s = v[i];
            cnt++;
        }
        if ( cnt > k )  return false;
    }

    return true;
}