#include <iostream>
#include <stdio.h>
using namespace std;
int v[16005];
int main()
{
    int n,k,i,s,st,dr,med,sum,ok,tr,last;
    FILE *fin, *fout;
    fin=fopen("transport.in", "r");
    fout=fopen("transport.out", "w");
    fscanf(fin, "%d%d", &n, &k);
    s=0;
    for(i=1; i<=n; i++)
    {
        fscanf(fin, "%d", &v[i]);
        s=s+v[i];
    }
    st=1;
    dr=s;

    while(st<=dr)
    {
        med=(st+dr)/2;
        sum=0;
        ok=1;
        tr=1;
        for(i=1; i<=n; i++)
        {
            if(sum+v[i]<=med)
                sum=sum+v[i];
            else
            {
                sum=v[i];
                tr++;
            }
        }
        if(tr<=k)
        {
            last=med;
            dr=med-1;
        }
        else
            st=med+1;
    }
    fprintf(fout, "%d", last );
    fclose(fin);
    fclose(fout);
    return 0;
}