#include <fstream>

using namespace std;

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

int n, k, a[16001], i, s;
int maxim, l, mid, r;

bool verif(int x)
{
    int i, s, z = 0;
    for (i = 1; i <= n;)
    {
        s = 0;
        while (s+a[i] <= x)
            s += a[i], i++;
        z++;
    }
    if (z <= k)
        return 1;
    return 0;
}

int main()
{
    f >> n >> k;
    for (i = 1; i <= n; i++)
    {
        f >> a[i];
        s += a[i];
        if (maxim < a[i])
            maxim = a[i];
    }
    int sol;

    r = s, l = maxim;
    while (l <= r)
    {
        mid = (r+l)/2;
        if (verif(mid) == 1)
            sol = mid, r = mid-1;
        else
            l = mid+1;
    }
    g << sol << "\n";
    return 0;
}