#include <bits/stdc++.h>
#define nmax 17002
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int v[nmax],n,k;
bool verif(int x)
{
    int trans=0;
    int i=0;
    while(trans<=k && i<=n)
    {
        int volum=0;
        while(volum+v[i]<=x)
        {
            volum+=v[i];
            i++;
        }
        trans++;
    }
    if(trans<=k)
        return true;
    return false;

}
int binary(int st,int dr)
{
    int sol;
    while(st<=dr)
    {
        int mid=st+ ((dr-st)>>1);
        if(!verif(mid))
            st=mid+1;
        else
        {
            dr=mid-1;
            sol=mid;
        }
    }
    return sol;
}
int main()
{
    fin>>n>>k;
    int st=-1;
    int dr=0;
    for(int i=1;i<=n;i++)
    {
        fin>>v[i];
        dr+=v[i];
        if(v[i]>st)
            st=v[i];
    }
    fout<<binary(st,dr);
    return 0;
}