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;
    // if(n<10)
    // cout<<n<<endl;
    while(n>9){
        int sum=0;
        while(n>0){
            sum+=n%10;
            n=n/10;
        }
        n=sum;
        
    }
    cout<<n<<endl;
}