#include <fstream>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
int n,k,mx,s,c1,c2,mij,sf,nr,i,v[16001];
int main()
{
    f >> n >> k;
    mx = -1;
    for(i = 1; i <= n; ++i)
    {
        f >> v[i];
        if(v[i] > mx)
            mx = v[i];
        s += v[i];
    }
    c1 = mx;
    c2 = s;
    while(c1 > c2)
    {
        mij = (c1 + c2) / 2;
        nr = 1;
        for(i = 1; i <= n; ++i)
        {
            sf += v[i];
            if(sf > mij)
            {
                sf = v[i];
                nr++;
            }
        }
        if(sf <= mij)
        {
            if(nr > k)
                c1 = mij + 1;
            else
                c2 = mij - 1;
            sf = 0;
        }
    }
    g << c1 << '\n';
    return 0;
}