184. You are given a number n,ranging from 1 to n. Out of which one number is missing. Your task is to print that missing number.

You are given a number n,ranging from 1 to n. Out of which one number is missing. Your task is to print that missing number.

 

Input Description:
You are given a number ‘n’.

Output Description:
Print the missing number.

Sample Input :
5
1 3 5 2
Sample Output :
4



n = int(input())
arr = list(map(int,input().split()))

# Find the total sum of the range from 1 to n
total_sum = n * (n+1) // 2

# Find the sum of the given numbers
given_sum = sum(arr)

# The missing number is the difference between the total sum and the given sum
missing_number = total_sum - given_sum

print(missing_number)