/*
    "TLE is like the wind, always by my side"
    - Yasuo - 2022 -
*/
#include <bits/stdc++.h>
#define debug(x) cerr << #x << " " << x << "\n"
#define debugs(x) cerr << #x << " " << x << " "


using namespace std;

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

int v[16001];

/*
    1 - dreapta
    2 - jos
    3 - stinga
    4 - sus
*/

int main()
{
    int n,i,k,s=0,poate=-1,gasit=0,drum;
    fin >> n >> k;
    for (i=1; i<=n; i++)
    {
        fin >> v[i];
        if (v[i]>poate)
            poate=v[i];
    }
    while (!gasit)
    {
        s=0;
        drum=0;
        for (i=1; i<=n; i++)
        {
            s+=v[i];
            if (s>poate)
            {
                drum++;
                s=v[i];
            }
        }
        drum++;
        if (drum<=k)
            gasit=1;
        else
            poate++;
    }
    fout << poate;
}