#include <fstream>

using namespace std;

ifstream in("transport.in");
ofstream out("transport.out");
int n, k, v[16000];

bool se_poate(int c)
{
    int cc = 0, nr = 0;
    for(int i = 1; i <= n; i++)
    {
        if(v[i] > c)
        {
            return false;
        }
        if(v[i] > cc)
        {
            nr++;
            cc = c;
        }
        cc -= v[i];
    }
    return (nr <= k);
}

int main()
{
    in >> n >> k;
    for(int i = 1; i <= n; i++)
    {
        in >> v[i];
    }
    int r = 0, pas = 1 << 27;
    while(pas != 0)
    {
        if(!se_poate(r+pas))
        {
            r += pas;
        }
        pas /= 2;
    }
    out << r + 1<< "\n";
    return 0;
}