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 CPP):

Solution:
#include <bits/stdc++.h>
using std::cin;
using std::cout;

int main() {
	int n;
	std::ios::sync_with_stdio(false), cin.tie(nullptr);
	cin >> n, cout << (n - 1) % 9 + 1 << '\n';
	return 0;
}