#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
bool valid(int camion,int k,int n,int v[])
{
    int i,S = 0;
    i = 0;
    while(i<n&&k>0){
        S = 0;
        while(S+v[i] <= camion && i<n){
            S+= v[i];
            i++;
        }
        k--;
    }
    return i==n;
}
int main()
{
    int n,i,k,camion,st,S,dr,v[16001],k1;
    fin>>n>>k;
    for(i = 0; i < n; i++){
        fin>>v[i];
    }
    st = 0;
    dr = 256000000;
    while(st <= dr){
        camion = (dr-st+1)/2 + st;
        if( valid(camion,k,n,v) == false){
            st = camion+1;
        }
        else{
            dr = camion-1;
        }
    }
    fout<<st;
}