#include <fstream>

using namespace std;
ifstream in ("transport.in");
ofstream out ("transport.out");
const int N=16002;
int v[N],n,k;

bool verif(int l)
{
    int i,s=0,cnt=0;
    for (i=1;i<=n;i++)
    {
        if (v[i]>s)
            cnt++, s=l;
        if (v[i]>s)
            return false;
        if (cnt>k)
            return false;
        s-=v[i];
    }
    return true;
}
int main()
{
    int i,r=0,pas=1<<30;
    in>>n>>k;
    for (i=1;i<=n;i++)
        in>>v[i];
    while (pas)
    {
        if (verif(r+pas)==0)
            r+=pas;
        pas/=2;
    }
    out<<r+1;
    return 0;
}