#include<bits/stdc++.h>
using namespace std;
#define int long long
#define vi vector<int>
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define pi 3.141592653589793238
#define eb emplace_back
#define rep(i,a,b) for (int i = a; i <= b; i++)
#define zip(i,a,b) for(int i=a;i<b;i++)
#define rzip(i,a,b) for(int i=a;i>=b;i--)
#define ll unsigned int
#define test int t;cin>>t; while(t--)
#define um unordered_map
#define en '\n'
#define us unordered_set
typedef pair<int, int>     pii;
typedef pair<char, int>    pci;
typedef pair<char, char>   pcc;
typedef vector<pii>       vii;
typedef long double ld;
#define all(v) v.begin(), v.end()
#define sz(x) (int)x.size()
#define INF (1e18+5)
#define inf (1e9+5)
#define mod 1000000007


void __print(int x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}
// You should only debug a pair of simple data types. For example,
// the debug won't work if one of pair's elements is collection type
// (std::vector, std::map, std::set...).
template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i : x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifndef ONLINE_JUDGE
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define debug(x...)
#endif


// bool check_prime(int n)  return whether a number is prime or not O(sqrt(N));
// int BE(int x,int n,int m)  return x^n%m; O(logN);
// void sieve()  from number 1-1000001 saare prime store kar lega  in bool is_prime[1000001] array
// vector<int> z_array(string s)  return vector which is Z-array of string s;
// vector<int> lps(string s)      return vector which is lps array of string s;



int32_t main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(0);
#ifndef ONLINE_JUDGE
	if (fopen("input.txt", "r"))
	{
		freopen ("input.txt" , "r" , stdin);
		freopen ("output.txt" , "w" , stdout);
	}
#endif
	//_______________________________-code starts-_______________________________________________
	// its incorrect approach as try n=1,l=6,k=2;
	// corrct answer 2 2 2
	// my answer 3 2 1
	// int n, k;
	// cin >> n >> k;
	// int a[n];
	// cout << fixed << setprecision(10);
	// multiset<double>s;
	// for(int i=0;i<n;i++)
	// {
	// 	cin >> a[i];
	// 	s.insert(1.000000000 * a[i]);
	// }
	// //sort(a, a + n, greater<int>());
	// for(int i=0;i<k;i++)
	// {
	// 	double x = *s.rbegin();
	// 	double a, b;
	// 	a = x / 2;
	// 	b = x / 2;
	// 	auto itr = s.find(x);
	// 	s.erase(itr);
	// 	s.insert(a);
	// 	s.insert(b);
	// }
	// cout << (int)*s.rbegin() << en;

	// mm what would be the correct approach
	// we can do binary search for answer
	int n, k;
	cin >> n >> k;
	int a[n];
	zip(i, 0, n)
	{
		cin >> a[i];
	}
	int l = 0, r = INF;
	int print;
	while (r - l > 1)
	{
		int m = (l + r) / 2;
		//print = m;

		// assuming answer is m
		int ans = 0;
		zip(i, 0, n)
		{
			if (a[i] > m)
			{
				ans += (a[i] - 1) / m;
			}
		}
		if (ans <= k)
		{
			r = m;
			print = m;
		}
		else
		{
			l = m ;
		}
	}
	cout << r << en;


	return 0;
}



Measured memory_bytes: 5156