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<stdio.h>
int main()
{
    long long n,x,sum=0;
    scanf("%lld",&n);
    while(n!=0)
    {
        x=n%10;
        sum=sum+x;
        n=n/10;
    }
    while(sum>9)
    {
        n=sum;
        sum=0;
        while(n!=0)
        {
        x=n%10;
        sum=sum+x;
        n=n/10;
        }
    }
    printf("%lld",sum);
    return 0;
}