#include <iostream>
#include <fstream>
using namespace std;
ifstream in("transport.in");
ofstream out ("transport.out");
int v[16002];
int main()
{
    int n,k,i,maxx=0,s=0,snou=0,st,dr,mijl,cnt=0;
    in>>n>>k;
    for(i=1; i<=n; i++)
    {
        in>>v[i];
        if(v[i]>maxx) maxx=v[i];
        s+=v[i];
    }
    st=maxx;
    dr=s+10;
    while(st<=dr)
    {
        mijl=(dr+st)/2;
        for(i=1; i<=n; i++)
        {
            if(snou+v[i]<=mijl) snou+=v[i];
            else
            {
                cnt++;
                snou=0;
                snou+=v[i];

            }
        }
        cnt++;

        if(cnt>k) st=mijl+1;
        else dr=mijl-1;
        snou=0;
        cnt=0;

    }
    out<<mijl;
    return 0;
}