Problem:
Score : 600 points

Problem Statement

We have a sequence of length N consisting of non-negative integers. Consider performing the following operation on this sequence until the largest element in this sequence becomes N-1 or smaller. (The operation is the same as the one in Problem D.)

Determine the largest element in the sequence (if there is more than one, choose one). Decrease the value of this element by N, and increase each of the other elements by 1.

It can be proved that the largest element in the sequence becomes N-1 or smaller after a finite number of operations.

You are given the sequence a_i. Find the number of times we will perform the above operation.

Constraints

2 ≤ N ≤ 50

0 ≤ a_i ≤ 10^{16} + 1000

Input

Input is given from Standard Input in the following format:

N
a_1 a_2 ... a_N

Output

Print the number of times the operation will be performed.

Sample Input 1

4
3 3 3 3

Sample Output 1

0

Sample Input 2

3
1 0 3

Sample Output 2

1

Sample Input 3

2
2 2

Sample Output 3

2

Sample Input 4

7
27 0 0 0 0 0 0

Sample Output 4

3

Sample Input 5

10
1000 193 256 777 0 1 1192 1234567891011 48 425

Sample Output 5

1234567894848

Solution in Lua (5.3.2) (judge verdict: Accepted)

local n = io.read("*n")
local a = {}
for i = 1, n do a[i] = io.read("*n") end
local cnt = 0

local function getminmax()
  local min, max, maxp = a[1], a[1], 1
  for i = 2, n do
    if max < a[i] then
      max, maxp = a[i], i
    end
    if a[i] < min then
      min = a[i]
    end
  end
  return min, max, maxp
end
while true do
  local min, max, maxp = getminmax()
  if max - min <= n then break end
  local rep = (max - min) // (n + 1)
  cnt = cnt + rep
  for i = 1, n do
    if i == maxp then
      a[i] = a[i] - rep * n
    else
      a[i] = a[i] + rep
    end
  end
end
do
  local min = getminmax()
  while n <= min do
    local rep = min // n
    cnt = cnt + rep * n * (n - 1)
    for i = 1, n do
      a[i] = a[i] - rep * (n - 1)
    end
    min = getminmax()
  end
end
while true do
  local min, max, maxp = getminmax()
  if max < n then break
  else
    cnt = cnt + 1
    for i = 1, n do
      if i == maxp then a[i] = a[i] - n
      else a[i] = a[i] + 1
      end
    end
  end
end

print(cnt)