#include <fstream>

using namespace std;

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

int n, k, saltele[16002], maxi;
long long int capacitate, avr, suma;

int main()
{
    cin >> n >> k;
    for(int i=1; i<=n; ++i)
    {
        cin >> saltele[i];
        suma += saltele[i];
        maxi = max(maxi, saltele[i]);
    }

    if(suma % k == 0) avr = suma / k;
        else avr = (suma / k) + 1;

    int st = maxi, dr;
    if(maxi >= avr) dr = suma;
        else dr = avr;

    while(st <= dr)
    {
        int mij = (st + dr) / 2;
        int transporturi = 0;
        suma = 0;
        for(int i=1; i<=n; ++i)
        {
            if(saltele[i] <= mij && (suma+saltele[i]) <= mij)
                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;
}