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>
#define ll long long
#define endl '\n'
using namespace std;
const int inf=0x3f3f3f;
const int N=2e5+5;

int main()
{
	int a;
	cin>>a;
	if(!(a%9))
	{
		cout<<9<<endl;
	}else{
		cout<<a%9<<endl;
	}

	return 0;
}