#include <fstream>

using namespace std;
ifstream cin ("transport.in");
ofstream cout ("transport.out");

int main()
{
    int n,k,maxi,s,dr,st,nrt,v[16001],sol,i,mij;
    cin >> n >> k;
    maxi=-1;s=0;
    for (i=1;i<=n;i++)
    {
        cin >> v[i];
        if (v[i]>maxi) maxi=v[i];
        s=s+v[i];
    }
    st=maxi;dr=s;
    while (st<=dr)
    {
        mij=(st+dr)/2;
        s=0;nrt=1;
        for (i=1;i<=n;i++)
        {
            if (s+v[i]<=mij)
                s=s+v[i];
            else
            {
                nrt++;
                s=v[i];
            }
        }
        if (nrt>k)
            st=mij+1;
        else
        {
            sol=mij;
            dr=mij-1;
        }
    }
    cout << sol;
    return 0;
}