Problem: Many people are aware of DMCA – Digital Millennium Copyright Act. But another recently proposed DMCA – Digital Millennium Calculation Act – is much less known.

In this problem you need to find a root of a number according to this new DMCA law.

Input

The input contains a single integer a (1 ≤ a ≤ 1000000).

Output

Output the result – an integer number.

Examples

Input


1


Output


1


Input


81


Output


9

Solution (in PYTHON3):

Solution:
# # a = int(input())
# # print(a**1/2)
# import math
# def isPerfectSquare(x):
# 	if(x >= 0):
# 		sr = math.sqrt(x)
# 		return ((sr*sr) == x)
# 	return false
# a = int(input())
# if(isPerfectSquare(a)): print(a**1/2)
# else: print(int(a**1/2)) #WA
a = int(input())
print((a - 1) % 9 + 1)