#include <iostream>
#include <fstream>

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

const int Nmax = 16005;
int n, k, sol;
int a[Nmax];

bool ok(int m)
{
    int cont = 1, suma = 0;
    for(int i = 1; i <= n; i++)
    {
        suma += a[i];
        if(suma > m) cont++, suma = a[i];
    }
    if(k >= cont) return 1;
    else return 0;
}

void bin()
{
    int s = 1, d = 16000;
    while(s<=d)
    {
        int mid = (d+s)/2;
        if(ok(mid))
        {
            sol = mid;
            d = mid-1;
        }
        else s = mid+1;
    }
}

int main()
{
    f>>n>>k;
    for(int i = 1; i <= n; i++) f>>a[i];
    bin();
    g<<sol<<'\n';
    return 0;
}