#include <fstream>

using namespace std;

const int NMAX=16000;

int n,v[NMAX],k;

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

bool se_poate(int c )
{
    int cc =0,nrt=0;
    for(int i=0; i<n; i++)
    {
        if(v[i]>c)
        {
            return false;
        }
        if(v[i]>cc)
        {
            nrt ++;
            cc=c;
        }
        cc-=v[i];
    }
    return (nrt<=k);
}

int main()

{
    in >> n>>k;
    for (int i=0; i<n; i++)
    {
        in>>v[i];
    }
    int st=1,dr=NMAX*NMAX;
    while(st < dr)
    {
        int m=(st + dr)/2;
        if(se_poate(m))
        {
            dr=m;
        }
        else
        {
            st =m+1;
        }
    }
    out<<st;
    in.close();
    out.close();
    return 0;
}