#include <fstream>

using namespace std;

ifstream cin ("transport.in");
ofstream cout ("transport.out");

const int NMAX = 16e3 + 5, INF = 1e9; /// 16 * 10^3

int v[NMAX];
int n, k;
int check(int x){
    int aux= 0, s = 0;
    for(int i = 0; i<n; i++){
        if(s + v[i]>x){
            aux++;
            s = 0;
        }
        s += v[i];
    }
    if(s) aux++;
    return aux;
    }
int main()
{

    cin >> n >> k;
    for(int i = 0; i<n; i++)
        cin >> v[i];
    int st = 0, dr = INF, rasp  = -1, ans;
    while(st<=dr){
        rasp = (dr+st)/2;
        if(check(rasp) <= k){
            ans = rasp;
            dr = rasp-1;
        }
        else{
            st = rasp + 1;
        }
    }
    cout << ans;


    return 0;
}