#include <fstream>

using namespace std;

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

int n, k, saltele[16002], capacitate;

int main()
{
    cin >> n >> k;
    for(int i=1; i<=n; ++i)
        cin >> saltele[i];

    int st = 1, dr = 16000;
    while(st <= dr)
    {
        int mij = (st + dr) / 2;
        int suma = 0, ok = 0, transporturi = 0;
        for(int i=1; i<=n; ++i)
        {
            if(saltele[i] <= mij && (suma+saltele[i]) <= mij)
                suma = suma + saltele[i];
            if((suma + saltele[i+1]) > mij)
            {
                suma = 0;
                transporturi++;
            }
        }
        if(suma != 0)
            transporturi++;
        if(transporturi > k)
            st = mij + 1;
        else{
            dr = mij - 1;
            capacitate = mij;
        }
    }

    cout << capacitate;
    return 0;
}