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:
# Bismillah
# In the name of GOD

def func(string):
	sum = 0
	for i in string:
		sum += int(i)
	if len(str(sum)) > 1:
		return func(str(sum))
	return sum

a = input()
print(func(a))