#include <fstream>

using namespace std;
ifstream in ("transport.in");
ofstream out ("transport.out");
int v[16001];
int main()
{
    int n, k, i, s, cnt, pas, r, ok;
    in>>n>>k;
    for (i=1; i<=n; i++)
    {
        in>>v[i];
    }
    pas=1<<28;
    r=0;
    while ( pas !=0 )
    {
        s=0;
        cnt=1;
        ok=1;
        for (i=1; i<=n; i++)
        {
            if (v[i] > r+pas)
                ok=0;
            if (s+v[i]<=r+pas)
                s+=v[i];
            else
            {
                cnt++;
                s=v[i];
            }
        }
        if (cnt > k || ok==0)
        {
            r+= pas;
        }
        pas/=2;
    }
    out<<r+1;
    return 0;
}