#include <fstream>

using namespace std;

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

short int v[16001];

int main()
{
    int sm,ss=0;
     int N,K,i,cc=-1,nrt,sol,mij,st,dr,s;
    cin>>N>>K;
    for(i=1;i<=N;i++){
        cin>>v[i];
        ss+=v[i];
        if(v[i]>cc)
            cc=v[i];
    }

    st=cc;
    dr=ss;
    while(st<=dr)
    {
        mij=(st+dr)/2;
        nrt=1;
        s=0;
        for(i=1;i<=N;i++)
            if(s+v[i]<=mij)
                s+=v[i];
            else
            {
                nrt++;
                s=v[i];
            }

        if(nrt>K)
            st=mij+1;
        else
        {
            sol=mij;
            dr=mij-1;
        }
    }
    cout<<sol;
    return 0;
}