#include <fstream>
#include <climits>

using namespace std;

ifstream in ("transport.in");
ofstream out ("transport.out");

short int v[16001],n,k;

bool verif (int x)
{
    short int last=0,j=k,i;
    for(i=0;i<=n;i++)
    {
        if(v[i]-last>x)
        {
            last=v[i-1];
            j--;
            i--;
        }
        if(j==0)
        {
            if(i<n)
                return 0;
            break;
        }
    }
    return 1;
}

int main()
{
    short int x,i;
    int suma=0,minim=INT_MAX,dr,st,m;
    in>>n>>k;
    for(i=1;i<=n;i++)
    {
        in>>x;
        v[i]=x+v[i-1];
        suma+=x;
    }
    st=suma/k;
    dr=suma;
    while(st<=dr)
    {
        m=(dr+st)/2;
        if(verif(m)!=true)
            st=m+1;
        else
        {
            minim=m;
            dr=m-1;
        }
    }
    out<<minim;
    return 0;
}