#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);
    fin >> n >> k;
    int x = 0;
    for(int i = 1; i <= n; i++){
             fin >> a[i];
             if(a[i] > x) x = a[i];
    }
    st = x; dr = 256000001;
    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;
    }
    fout << st;
    return 0;
}