#include <iostream> 
#include <fstream>
#include <vector>
#include <queue>

using namespace std;

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

int n, k, v[16000], suma, MAX;

/*bool ok(int x) {
	int sum = 0, j = 0;
	for (int i = 0; i < k; ++i) {
		sum = 0;
		while (sum <= x - v[j]){
			sum += v[j];
			suma -= v[j];
			++j;
			}
	}
	if (suma > 0)
		return false;
	return true;
}*/

bool ok(int x)
{
	int nrt = 0, cc = 0;
	for (int i = 0; i < n; i++)
	{
		if (v[i] > x)
		{
			return false;
		}
		if (v[i] > cc)
		{
			nrt++;
			cc = x;
		}
		cc -= v[i];
	}
	return (nrt <= k);
}

int main() {
	int i;
	fin >> n >> k;

	for (i = 0; i < n; ++i) {
		fin >> v[i];
		suma += v[i];
		if (v[i] > MAX)
			MAX = v[i];
	}

	int st = MAX, dp = suma, mid;
	while (st < dp) {
		mid = (st + dp) / 2;
		if (ok(mid)) {

			dp = mid;
		}
		else {
			st = mid + 1;
		}

	}
	fout << st;

	return 0;
}