Problem Statement

We have N logs of lengths $A_1,A_2,\cdots A_N$.
We can cut these logs at most K times in total. When a log of length L is cut at a point whose distance from an end of the log is t (0<t<L), it becomes two logs of lengths t and L-t.
Find the shortest possible length of the longest log after at most K cuts, and print it after rounding up to an integer.

Input

Input is given from Standard Input in the following format:
N K
$A_1 A_2 \cdots A_N$

Output

Print an integer representing the answer.

Constraints

• $1 \leq N \leq 2 \times 10^5$
• $0 \leq K \leq 10^9$
• $1 \leq A_i \leq 10^9$
• All values in input are integers.

Sample Input 1

2 3
7 9

Sample Output 1

4

• First, we will cut the log of length 7 at a point whose distance from an end of the log is 3.5, resulting in two logs of length 3.5 each.
• Next, we will cut the log of length 9 at a point whose distance from an end of the log is 3, resulting in two logs of length 3 and 6.
• Lastly, we will cut the log of length 6 at a point whose distance from an end of the log is 3.3, resulting in two logs of length 3.3 and 2.7.

In this case, the longest length of a log will be 3.5, which is the shortest possible result. After rounding up to an integer, the output should be 4.

Sample Input 2

3 0
3 4 5

Sample Output 2

5

Sample Input 3

10 10
158260522 877914575 602436426 24979445 861648772 623690081 433933447 476190629 262703497 211047202

Sample Output 3

292638192

见题面 Input 部分

见题面 Output 部分