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 namespace std; 

#define ll long long
const ll mxn=2*1e5+4;

void solve(){
	ll n;
	cin >> n;
	n%=9;
	if(!n) n=9;
	cout << n << endl;
}	

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	int t=1;
	//cin >> t;		
	while(t--)
		solve();
	return 0;
}