#include <fstream>

using namespace std;
const int NMAX=16000;
int n,v[NMAX],k;

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

bool se_poate(int c)
{
    int cc=0,nrt=0;
    for(int i=0;i<n;i++)
    {
        if(v[i]>c)
        {
            return false;
        }
        if(v[i]>cc)
        {
            nrt++;
            cc=c;
        }
        cc -=v[i];
    }
    return(nrt<=k);
}
int main()
{
    in>>n>>k;
    for(int i=0;i<n;i++)
    {
        in>>v[i];
    }
    int c=1;
    while(!se_poate(c))
    {
        c++;
    }
    out<<c;
    in.close();
    return 0;
}