//#include "pch.h"
#include <iostream>
#include <fstream>

using namespace std;

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

long long v[16005];

bool good(long long x, int n, int k) {
	long long cur = 0;
	int trans = 1;
	
	for (int i = 1; i <= n; ++i) {
		if (x < v[i]) return false;

		if (cur + v[i] <= x) {
			cur += v[i];
		}
		else {
			cur = v[i];
			trans++;
			if (trans > k) {
				return false;
			}
		}
	}

	if (trans > k) {
		return false;
	}

	return true;
}

int main()
{
	ios::sync_with_stdio(false);
	fin.tie(0); fout.tie(0);

	int n, k;
	fin >> n >> k;
	for (int i = 1; i <= n; ++i) {
		fin >> v[i];
	}

	long long left = 1;
	long long right = 256000000;
	long long mid;

	while (left <= right) {
		mid = left + (right - left) / 2;
		if (good(mid, n, k)) {
			right = mid - 1;
		}
		else {
			left = mid + 1;
		}
	}

	fout << mid << '\n';
}