#include <bits/stdc++.h>

using namespace std;

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

int n,k,a[16003];

int Test(int C)
{
    int i,cnt = 1,s = 0;
    for(i = 1;i <= n;++i)
    {
        if(a[i] > C) return 0;
        if(s + a[i] <= C)
            s += a[i];
        else
        {
            ++cnt;
            s = a[i];
        }
    }
    return (cnt <= k);
}

int CB()
{
    int st,dr,mij,p;
    st = p = 1; dr = 256000000;
    while(st <= dr)
    {
        mij = (st + dr) / 2;
        if(Test(mij))
        {
            p = mij;
            dr = mij - 1;
        }
        else st = mij + 1;
    }
    return p;
}

int main()
{
    int i;
    fin >> n >> k;
    for(i = 1;i <= n;++i)
        fin >> a[i];
    fout << CB() << "\n";
    fout.close();
    return 0;
}