#include <fstream>

using namespace std;
ifstream cin ("transport.in");
ofstream cout ("transport.out");
int stiva[16001];
int n,k,i,mx,st,dr,mij,val,c,s;
int main()
{
    cin >>n>>k;
    for (i=1; i<=n; i++)
    {
        cin >>stiva[i];
        if (stiva[i]>mx) {mx=stiva[i];}
    }
    st=mx;
    dr=n*16000;
    while (st<=dr)
    {
        mij=(st+dr)/2;
        c=1;
        s=0;
        for (i=1; i<=n&&c<=k; i++)
        {
            if (s+stiva[i]>mij)
            {
                s=stiva[i];
                c++;
            }
            else
            {
                s=s+stiva[i];
            }
        }
        if (c<=k)
        {
            val=mij;
            dr=mij-1;
        }
        else
        {
            st=mij+1;
        }
    }
    cout <<val;
    return 0;
}