#ifndef __OPTIMIZE_H__
#define __OPTIMIZE_H__

/* updated: 2020-07-22 */

#include <cstdint>
#include <cmath>
#include <vector>
#include <stack>

/* std::not_fn などに相当するものを自作するほうがいいか？ */

/* findAllBoundaries の戻り値 */
template <class Value>
struct BoundariesResult {
	std::vector<int64_t> args;		// func の引数の列
	std::vector<Value> vals;		// func の戻り値の列
};

template <class Function>
int64_t findBoundary(Function func, int64_t lower, int64_t upper, bool greater = false);
template <class Function>
double findBoundaryFloat(Function func, double lower, double upper, bool greater = false);
template <class Function>
double findOptimumFloat(Function func, double lower, double upper, bool maximize = false);
template <class Function>
auto findAllBoundaries(Function func, int64_t lower, int64_t upper) -> BoundariesResult<decltype(func(lower))>;

/*
// 関数 func : int64_t -> bool に対して
// 二分探索で true と false の境界を(1つ)見つける O(log(upper - lower))
// 探索範囲は [lower, upper)
// デフォルトでは func(i - 1) == true かつ func(i) == false となる i を返す (lower <= i <= upper)
// greater を指定すると真偽を逆にする
*/
template <class Function>
int64_t findBoundary(Function func, int64_t lower, int64_t upper, bool greater) {
	int64_t lo = lower - 1;
	int64_t hi = upper;
	while (hi - lo > 1) {
		int64_t mid = (lo + hi) / 2;
		if (func(mid) == greater) {
			hi = mid;
		} else {
			lo = mid;
		}
	}
	return hi;
}

/*
// 関数 func : double -> bool に対して
// 二分探索で true から false に変化する境界を(1つ)見つける
// greater を指定すると真偽を逆にする
*/
template <class Function>
double findBoundaryFloat(Function func, double lower, double upper, bool greater) {
	constexpr double precision = 1e-9;
	const int iterations = (int)(std::log2(upper - lower) - std::log2(precision)) + 1;
	double lo = lower;
	double hi = upper;
	for (int i = 0; i < iterations; ++i) {
		double mid = (lo + hi) / 2;
		if (func(mid) == greater) {
			hi = mid;
		} else {
			lo = mid;
		}
	}
	return hi;
}

/*
// 関数 func : double -> double に対して
// 三分探索で極小値をとる点を見つける(maximize を指定すると極大値を探索する)
*/
template <class Function>
double findOptimumFloat(Function func, double lower, double upper, bool maximize) {
	constexpr double precision = 1e-9;
	constexpr double ratio = 1.5;
	const int iterations = (int)((std::log(upper - lower) - std::log(precision)) / std::log(ratio)) + 1;
	
	double lo = lower;
	double hi = upper;
	for (int i = 0; i < iterations; ++i) {
		double mid_lo = (ratio * lo + hi) / (1 + ratio);
		double mid_hi = (lo + ratio * hi) / (1 + ratio);
		double val_lo = func(mid_lo);
		double val_hi = func(mid_hi);
		if ((val_lo > val_hi) == maximize) {
			hi = mid_hi;
		} else {
			lo = mid_lo;
		}
	}
	return hi;
}

/*
// 関数 func : int64_t -> Value(任意) に対して
// 二分探索で値が変化する点をすべて見つける O(min(range, 変化する点数 * log(range)))
// 探索区間 [lower, upper) 内で同じ値を返す区間が複数登場してはならない
// 戻り値は func(x) が等しい区間の左端の列 (args) とそれに対応する func の値の列 (vals) 
// (ただし lower を含み upper を含まない)
// 例えば区間 [0, 6) に対する func の値が { 4, 4, 4, 2, 2, 5 } なら
// (args, vals) = ( { 0, 3, 5 }, { 4, 2, 5 } ) を返す
*/
template <class Function>
auto findAllBoundaries(Function func, int64_t lower, int64_t upper) -> BoundariesResult<decltype(func(lower))> {
	using Value = decltype(func(lower));		// 値の型を推論
	struct Mapping {
		int64_t arg;
		Value val;
		Mapping(int64_t arg, Value val)
			: arg(arg), val(val) {
		}
	};
	using Range = std::pair<Mapping, Mapping>;

	/* 区間として正当かどうかチェック */
	if (upper <= lower) return BoundariesResult<Value>();

	/* 区間 [lower, upper - 1] の両端の値を計算し、戻り値用配列に追加 */
	int64_t lower_arg = lower;
	int64_t upper_arg = upper - 1;
	Value lower_val = func(lower_arg);
	Value upper_val = func(upper_arg);

	std::vector<int64_t> ret_args;
	std::vector<Value> ret_vals;
	ret_args.push_back(lower_arg);
	ret_vals.push_back(lower_val);

	/* 区間全体が同じ値を返すなら終了 */
	if (lower_val == upper_val) {
		BoundariesResult<Value> ret;
		ret.args = std::move(ret_args);
		ret.vals = std::move(ret_vals);
		return ret;
	}

	/* 区間 [lower, upper - 1] の両端の値が異なるなら stack に追加 */
	std::stack<Range> stack;
	stack.push(Range(
		Mapping(lower_arg, lower_val),
		Mapping(upper_arg, upper_val)
	));

	/* 両端の値が異なる限り二分探索で境界を探索 */
	while (!stack.empty()) {
		/* 区間 [l_arg, r_arg] に注目 */
		auto pair = stack.top(); stack.pop();
		Mapping l = pair.first;
		Mapping r = pair.second;
		int64_t l_arg = l.arg;
		int64_t r_arg = r.arg;
		Value l_val = l.val;
		Value r_val = r.val;

		/* 区間幅が 1 なら終了 (r_arg が境界) */
		if (r_arg - l_arg == 1) {
			ret_args.push_back(r_arg);
			ret_vals.push_back(r.val);
			continue;
		}

		/* 区間 [l_arg, m_arg] と [m_arg, r_arg] に分割 */
		int64_t m_arg = (l_arg + r_arg) / 2;
		Value m_val = func(m_arg);

		/* 各区間について、両端の値が異なるなら stack に追加 */
		/* stack から取り出す順序の都合上、区間 [m, r] -> 区間 [l, m] の順で追加 */
		if (m_val != r_val) {
			stack.push(Range(
				Mapping(m_arg, m_val),
				Mapping(r_arg, r_val)
			));
		}

		if (m_val != l_val) {
			stack.push(Range(
				Mapping(l_arg, l_val),
				Mapping(m_arg, m_val)
			));
		}
	}

	BoundariesResult<Value> ret;
	ret.args = std::move(ret_args);
	ret.vals = std::move(ret_vals);
	return ret;
}

#endif
#define _CRT_SECURE_NO_WARNINGS
#define _SCL_SECURE_NO_WARNINGS
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cassert>
#include <iostream>
#include <string>
#include <vector>
#include <list>
#include <utility>
#include <algorithm>
#include <functional>
#include <cmath>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <iomanip>
#include <sstream>
#include <bitset>
#include <limits>
#include <numeric>
#include <valarray>
#include <fstream>
#include <array>
#include <random>
#include <unordered_set>
#include <unordered_map>

using namespace std;
using uint = uint32_t;
using LL = int64_t;
using ULL = uint64_t;
using PP = pair<LL, LL>;
template <typename T> using PriorityQ = priority_queue<T, vector<T>, greater<T> >;
#define REP(i, a, n) for(LL i = (a), i##_max_ = (n); i < i##_max_; ++i)
#define REM(i, a, n) for(LL i = (LL)(n) - 1, i##_min_ = (a); i >= i##_min_; --i)
#define FLOAT fixed << setprecision(16)
#define SPEEDUP { cin.tie(NULL); ios::sync_with_stdio(false); }
const int INF = 0x3FFFFFFF;
const LL INFLL = 0x3FFFFFFF3FFFFFFF;
const double INFD = 1.0e+308;
const double EPS = 1.0e-9;

void YesNo(bool b) { cout << (b ? "Yes" : "No") << endl; }
void YESNO(bool b) { cout << (b ? "YES" : "NO") << endl; }
template <class T, class U> istream& operator>>(istream& ist, pair<T, U>& right) { return ist >> right.first >> right.second; }
template <class T, class U> ostream& operator<<(ostream& ost, const pair<T, U>& right) { return ost << right.first << ' ' << right.second; }
template <class T, class TCompatible, size_t N> void Fill(T(&dest)[N], const TCompatible& val) { fill(dest, dest + N, val); }
template <class T, class TCompatible, size_t M, size_t N> void Fill(T(&dest)[M][N], const TCompatible& val) { for (int i = 0; i < M; ++i) Fill(dest[i], val); }
template <class T> T Next() { T buf; cin >> buf; return buf; }
istream& Ignore(istream& ist) { string s; ist >> s; return ist; }
bool Inside(int i, int j, int h, int w) { return i >= 0 && i < h&& j >= 0 && j < w; }

#ifdef ONLY_MY_ENVIR
#include "Accumulator.h"
#include "Algebraic.h"
#include "BinaryMatrix.h"
#include "BinaryTree.h"
#include "Bipartite.h"
#include "BIT.h"
#include "Compressor.h"
#include "Decompositions.h"
#include "DiscreteLog.h"
#include "DynamicMod.h"
#include "Exponential.h"
#include "Factorization.h"
#include "FFT.h"
#include "FlowSolver.h"
#include "Geometric2D.h"
#include "Geometric2DFloat.h"
#include "Geometric3D.h"
#include "Geometric3DFloat.h"
#include "Graph.h"
#include "GraphUtil.h"
#include "Interpolation.h"
#include "IntMod.h"
#include "KDTree.h"
#include "LazySegmentTree.h"
#include "LIS.h"
#include "List.h"
#include "Math.h"
#include "MathUtil.h"
#include "Matrix.h"
#include "MinCostFlowSolver.h"
#include "MinMax.h"
#include "Numbers.h"
#include "Optimize.h"
#include "Permutation.h"
#include "Polynomial.h"
#include "Position.h"
#include "Random.h"
#include "Range.h"
#include "Rational.h"
#include "RuntimeMod.h"
#include "SegmentTree.h"
#include "SegmentTree2D.h"
#include "Sets.h"
#include "Shortest.h"
#include "SlidingWindow.h"
#include "SpanningTree.h"
#include "StringSearching.h"
#include "SuffixArray.h"
#include "SwitchList.h"
#include "Timer.h"
#include "Tree.h"
#include "TreeUtil.h"
#include "UnionFind.h"
#include "Util.h"
#include "VectorUtil.h"
#endif

#ifdef __GNUC__
typedef __int128 LLL;
istream& operator>>(istream& ist, __int128& val) { LL tmp; ist >> tmp; val = tmp; return ist; }
ostream& operator<<(ostream& ost, __int128 val) { LL tmp = val; ost << tmp; return ost; }
#endif

LL n, k;
LL a[200000];
bool ok(LL x) {
	int cnt = 0;
	REP(i, 0, n) {
		cnt += (a[i] + x - 1) / x - 1;
	}
	return cnt <= k;
}

int main() {
	cin >> n >> k;
	REP(i, 0, n) cin >> a[i];
	cout << findBoundary(ok, 1, INF, true) << endl;
	return 0;
}



Measured memory_bytes: 5100