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;
    int ans=0,ans1=0,ans2=0;
    while(n!=0)
    {
        ans+=n%10;
        n/=10;
        
        
    }
    while(ans!=0)
    {
        ans1+=ans%10;
        ans/=10;
        
    }
    while(ans1!=0)
    {
        ans2+=ans1%10;
        ans1/=10;
        
    }
    cout<<ans2;
    
}