#include <iostream>
#include <fstream>
using namespace std;
ifstream fi("transport.in");
ofstream fo("transport.out");
int v[16002],n,k,s1;

int main() {
    fi>>n>>k;
    int mx=0;
    for (int i=1;i<=n;i++){
        fi>>v[i];
        s1=s1+v[i];
        if (v[i]>mx)
            mx=v[i];
    }
    while (mx<s1) {
        int mid=(mx+s1)/2,s2=0,t=1;
        for (int i=1;i<=n;i++)
            if (s2+v[i]<=mid)
                s2=s2+v[i];
            else {
                s2=v[i];
                t++;
            }
        if (t>k)
            mx=mid+1;
        else s1=mid;
    }
    fo<<mx;
    return 0;
}