#include <bits/stdc++.h>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int main()
{
    long long n, v[16005], k, sol, st=0, dr=0, t;
    fin>>n>>k;
    for(int i=1; i<=n; ++i){
        fin>>v[i];
        if(v[i]>st)
            st=v[i];
        dr+=v[i];
    }
    while(st<=dr){
        t=(st+dr)/2;
        sol=1;
        long long crrs=0;
        for(int i=1; i<=n; ++i){
            if(v[i]>t){
                sol=k+1;
                break;
            }
            if(crrs+v[i]<=t)
                crrs+=v[i];
            else{
                ++sol;
                crrs=v[i];
            }
        }
        if(sol>k)
            st=t+1;
        else
            dr=t-1;
    }
    fout<<st;
    return 0;
}