#include <fstream>

using namespace std;

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

int v[17001];
int main()
{
    int n,i,k,s,drumuri,mij,st,dr,elem;
    cin>>n>>k;
    for(i=1;i<=n;i++)
        cin>>v[i];
    dr=1600000;
    st=1;
    elem=0;
    while(st<=dr){
        mij=(dr+st)/2;
        s=0;
        drumuri=0;
        for(i=1;i<=n && v[i]<=mij;i++){
            if(s+v[i]<=mij)
                s+=v[i];
            else{
                drumuri++;
                s=v[i];
            }
        }
        if(s<=mij)
            drumuri++;
        if(drumuri>k || i<n+1)
            st=mij+1;
        else
        {
            dr=mij-1;
            elem=mij;
        }
    }
    cout<<elem;
    return 0;
}