# include <fstream>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
int n, k, v[16000], maxi;
long long suma, sol;
bool verifica(long long cant);
long long cautare(long long st, long long dr);
int main()
{
    int i;
    f>>n>>k;
    for (i=1; i<=n; i++)
    {
      f>>v[i];
      if (v[i]>maxi)
        maxi=v[i];
      suma+=v[i];
    }
    if (verifica(maxi))
        g<<maxi;
    else
        g<<cautare(maxi+1, suma);
    return 0;

}
bool verifica(long long cant)
{
    int i=1, aux=k;
    while (i<=n)
    {
        long suma_part=0;
        while (suma_part+v[i]<=cant && i<=n)
        {
            suma_part+=v[i];
            i++;
        }
        aux--;
    }
    if (aux>=0)
        return 1;
    else
        return 0;
}
long long cautare(long long st, long long dr)
{
    int mid;
    while (st<=dr)
    {
        mid=(st+dr)/2;
        if (verifica(mid))
            {
                sol=mid;
                dr=mid-1;
            }
        else
            st=mid+1;
    }
    return sol;
}