#include <iostream>
#include <fstream>

using namespace std;

ifstream fin ("transport.in");
ofstream fout ("transport.out");

short int v[16000];

int main()
{
    short int n,k,maxi=0,i;
    fin>>n>>k;
    int s=0;
    for(i=0;i<n;i++){
        fin>>v[i];
        if(v[i]>maxi)
            maxi=v[i];
        s+=v[i];
    }
    int dr=s,st=maxi,mijl,t=s,ss;
    while(st<=dr){
        mijl=(st+dr)/2;
        ss=1;
        s=0;
        for(i=0;i<n;i++){
            s+=v[i];
            if(s>mijl){
                s=v[i];
                ss++;
                }
        }
        if(ss<=k){
            t=mijl;
            dr=mijl-1;
            }
        else
            st=mijl+1;
    }
    fout<<t;

    return 0;
}