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;
 
 
 int main()
 {
      int n;
      cin>>n;
       if(n%9==0){
           cout<<9;
       }
       else{
           cout<<n%9;
       }
 }