Enter your code here. Read input from STDIN. Print output to STDOUT

k=int(input()) list_k=list(map(int,input().split()))

Use set to get the unique value in the list

room_set = set(list_k)

now we are multiplying sum of the set with k first

then we are subtracting it with the original list's sum (so that only the captains value*(k-1) remains)

then we are dividing by (k-1) to get the actual value

captain_room = (sum(room_set)*k - sum(list_k)) // (k-1)

print(captain_room)