#include <fstream>

using namespace std;
ifstream cin("transport.in");
ofstream cout("transport.out");
int v[20001], mx, s, u, nr, k, mij, p, n, i, sol;
int main()
{
    cin>>n>>k;
    for(i=1;i<=n;i++)
    {
        cin>>v[i];
        if(v[i]>mx)
            mx=v[i];
        s=s+v[i];
    }
    p=mx;
    u=s;
    while(p<=u)
    {
        mij=(p+u)/2;
        nr=1;
        s=0;
        for(i=1;i<=n;i++)
        {
            s=s+v[i];
            if(s>mij)
            {
                nr++;
                s=v[i];
            }
        }
        if(nr<=k)
        {
            sol=mij;
            u=mij-1;
        }
        else p=mij+1;
    }
    cout<<sol;
    return 0;
}