#include <stdio.h>
#include <stdlib.h>
int v[16000];
int main()
{
    FILE *fin,*fout;
    int n,k,s,max,i,l1,l2,m,nr;
    fin=fopen("transport.in","r");
    fout=fopen("transport.out","w");
    fscanf(fin,"%d%d",&n,&k);
    s=0;
    max=0;
    for(i=0;i<n;i++)
    {
        fscanf(fin,"%d",&v[i]);
        if(max<v[i])
           max=v[i];
        s=s+v[i];
    }
    l1=max;
    l2=s;
    while(l1<=l2)
    {
        nr=1;
        s=0;
        m=(l1+l2)/2;
        for(i=0;i<n;i++)
        {
            s=s+v[i];
            if(s>m)
            {
                nr++;
                s=v[i];
            }
        }
        if(nr>k)
            l1=m+1;
        else
            l2=m-1;
    }
    fprintf(fout,"%d\n",l1);
    fclose(fin);
    fclose(fout);
    return 0;
}