#include <fstream>

using namespace std;

int v[16001];

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

int main()
{
    int n,k,max=-1,s=0,i,st,dr,mij,tr,sol;
    cin>>n>>k;
    for(i=1;i<=n;i++)
    {
        cin>>v[i];
        s=s+v[i];
        if(max<v[i])
        {
            max=v[i];
        }
    }
    st=max;
    dr=s;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        s=0;
        tr=1;
        for(i=1;i<=n;i++)
        {
            if(s+v[i]<=mij)
            {
                s=s+v[i];
            }
            else
            {
                s=v[i];
                tr++;
            }
        }
        if(tr>k)
        {
            st=mij+1;
        }
        else
        {
            sol=mij;
            dr=mij-1;
        }
    }
    cout<<sol;
    return 0;
}