#include <iostream>
#include <fstream>

using namespace std;

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

long long st, dr, n, k, a[16003], piv, sum, p;

int main()
{
    //ios::sync_with_stdio(0);
    //fin.tie(0);
    cin >> n >> k;
    for(int i = 1; i <= n; i++) cin >> a[i];
    st = 1; dr = 100000000;
    while(st <= dr)
    {
             piv = st + (dr - st) / 2;
             sum = 0;
             p = 1;
             for(int i = 1; i <= n; i++)
             {
                     sum += a[i];
                     if(sum > piv)
                     {
                            sum = a[i];
                            p++;
                     }
                     
                     
             }
             if(p <= k) dr = piv - 1;
             if(p > k) st = piv + 1;
    }
    cout << st;
    return 0;
}