#define boostIO ios_base::sync_with_stdio(false); fin.tie(nullptr); fout.tie(nullptr);
#pragma GCC optimize ("Ofast")
#include <bits/stdc++.h>

using namespace std;

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

const int MAX_N = 2e4;

int st, md, dr;
int n, k, v[MAX_N];

bool solve(int limit){
    int need = 1, crt = 0;
    for(int i=1; i<=n; i++){
        if(crt + v[i] <= limit)
            crt += v[i];
        else{
            need++;
            crt = v[i];
        }
    }

    if(need <= k)
        return true;
    else
        return false;
}

int main (){
    fin>>n>>k;
    for(int i=1; i<=n; i++){
        fin>>v[i];
        dr += v[i];
        st = max(st, v[i]);
    }

    while(st <= dr){
        md = (dr - st) / 2 + st;

        if(solve(md) == true)
            dr = md - 1;
        else
            st = md + 1;
    }
    fout<<st;
    return 0;
}