#include <fstream>
#define Nmax 16010
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n,k,st,dr,v[Nmax],sol;
int valabil(int val)
{
    int S=v[1],nr=1;
    for (int i=2;i<=n;i++)
    {
        if (S+v[i]<=val)
            S+=v[i];
        else
        {
            nr++;
            S=v[i];
        }
    }
    if (nr<=k)
        return 1;
    return 0;
}
void cautare_binara()
{
    while (st<=dr)
    {
        int mij=(st+dr)/2;
        if (valabil(mij)){
            sol=mij;
            dr=mij-1;
        }
        else
            st=mij+1;
    }
    fout<<sol;
}
int main()
{
    int i;
    fin>>n>>k;
    for (i=1;i<=n;i++)
    {
        fin>>v[i];
        st=max(st,v[i]);
        dr+=v[i];
    }
    cautare_binara();
    return 0;
}