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>
#include<vector>
#include<cmath>
#include<algorithm>
#include<string>
using namespace std;

int main()
{
    int i,j,n,sum=0;
    cin>>n;
    sum=n;
    while(sum>9)
    {
        n=sum;
        sum=0;
    while(n)
    {
        sum+=n%10;
        n/=10;
    }
    
    }
    cout<<sum;
}