#include<iostream>
#include<fstream>
using namespace std;

ifstream f("transport.in");
ofstream g("transport.out");

int main()
{
    int v[16100],i,n,k,maxim=0,t;
    long sum=0,s;
    f>>n;
    f>>k;
    for (i=0;i<n;i++)
        {f>>v[i];
        sum+=v[i];
         if (v[i] > maxim) maxim = v[i];
        }

    if (sum%k) sum = sum/k+1;
    else sum = sum/k;

    if (sum > maxim) maxim = sum;

    t=k+1;
    while (t > k)
    {
        t = 0;
        s = 0;
        for (i=0;i<n && t<=k;i++)
            if ((s+v[i]) <= maxim) s=s+v[i];
            else {t++; s=v[i];}
            t++;
        if (t > k) maxim++;
    }
    g<<maxim;

    return 0;
}