#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out")
int i, s, v[16001], rezultat, k, n, step, rez;
bool drive(int loc)
{
    int i=1, rasp=1, s=0;
    while(i<=n)
    {
        if(v[i]>loc)
        {
            return 0;
        }
        if(s+v[i]>loc)
        {
            rasp++;
            s= v[i];
        }
        else s+=v[i];
        i++;
    }

    if(rasp>k)
    {
        return 0;
    }
    return 1;
}
int main()
{
    fin>>n>>k;
    for(int i=1;i<=n;i++)
    {
        fin>>v[i];
        s+=v[i];
    }

    int st=1, dr=s;
    int mij = (st+dr)/2;

    while(st<=dr)
    {
       if( drive(mij) == 1)
       {
           rezultat= mij;
           dr=mij-1;
       }
       else st= mij+1;
       mij= (st+dr)/2;
    }
    fout<<rezultat;
}