#include <fstream>
#include<iostream>
using namespace std;
int v[16001];
int n,elem,k,i,cap,trans,l1,l2,m,s;
int main(){
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    cin>>n>>k;
    s=0;
    for(i=1;i<=n;i++){
        cin>>v[i];
        s+=v[i];
        //if(max<v[i])
          //  max=v[i];
    }
    l1=0;
    l2=s;
    while(l1<l2){
        m=(l1+l2)/2;
        trans=1;
        cap=0;
        for(i=1;i<=n;i++)
            if(cap+v[i]<=m)
                cap+=v[i];
            else{
                trans++;
                cap=v[i];
            }
        if(trans>k){

            l1=m+1;
        }
        else{
            l2=m-1;
           // elem=m;
        }
    }
    cout<<l1;
    return 0;
}