#include <fstream>
using namespace std;
ifstream cin("transport.in");
ofstream cout("transport.out");
const int Nmax=16005;
int v[Nmax],n,k;
bool ok(int c)
{
    int s=0,i,tr=0;
    for (i=1; i<=n; i++)
    {
        if(v[i]>c)
            return false;
        s+=v[i];
        if(s>c)
            tr++, s=v[i];
    }
    if(s<=c)
        tr++;
    return tr<=k;
}
int bs(int st, int dr)
{
    int last=-1, med;
    while(st<=dr)
    {
        med=(st+dr)/2;
        if(ok(med))
            last=med, dr=med-1;
        else
            st=med+1;
    }
    return last;
}
int main()
{
    int i,vmax=0;
    cin>>n>>k;
    for (i=1; i<=n; ++i)
    {
        cin>>v[i];
        vmax+=v[i];
    }
    cout<<bs(1, vmax);
    return 0;
}