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 JAVA):

Solution:
import java.util.*;
import java.io.*;
public class main {
static FastScanner sc;
static PrintWriter pw;
static void pn(Object o){pw.println(o);}
static void p(Object o){pw.print(o);}
static boolean arr[] = sieve(2000000);

        public static void solve()
        {
            // ArrayList<Integer> al = new ArrayList<>();
            // Map<Integer,Integer> map = new HashMap<>();
            // Set<Integer> set = new TreeSet<>();
            // for(Map.Entry<Integer,Integer> e:map.entrySet())pn(e.getKey()+" "+e.getValue());
            int n = sc.i();
            pn(1+(n-1)%9);
            // long sum=0;
            // for(int i=0;i<arr.length;i++)
            // {
            //     if(arr[i])sum+=i;
            // }
            // pn(sum);
        }
        public static void main(String[] args) throws FileNotFoundException {
//	        Scanner sc = new Scanner(System.in);
            sc = new FastScanner();
            pw = new PrintWriter(System.out);
            
            int tc = 1;
            for(int t=1;t<=tc;t++)
            {
                solve();
            } 
             pw.close();
        }
        // public static int solve(int a[],int l , int r) {
		
        //     for(int i=l+1;i<r;i++) {
        //         if(a[i]<a[i-1]) {
        //             int mid = (l+r)/2;
        //             return Math.max(solve(a,l,mid),solve(a,mid,r));
        //         }
        //     }
        //     return r-l;
        // }
        static boolean isSorted(int[] a)
        {
            int n = a.length;
            for(int i=1;i<n;i++)
            {
                if(a[i-1]>a[i])return false;
            }
            return true;
        }
        static boolean solution(int n,int x)
        {
            int sum=0;
            while(n>0)
            {
                int digit=n%10;
                n/=10;
                sum+=digit;
            }
            return (sum==x)?true:false;
        }
        static ArrayList<Integer> perfectSquares(int n) 
        { 
            ArrayList<Integer> al = new  ArrayList<Integer>();
            for(int i=1;i<=n;i++)
            {
                al.add(i*i);
            }
            return al; 
        } 
    static boolean checkDuplicateAll(String s)
    {
        for(int i=1;i<s.length();i++)
        {
            if(s.charAt(i)!=s.charAt(i-1))return false;
        }
        return true;
    }
    static String reverseString(String s)
    {
        String ans = "";
        for(int i=0;i<s.length();i++)
        {
            ans = s.charAt(i)+ans;
        }
        return ans;
    }
    static boolean checker(int num)
    {
        String s = num+"";
        if(s.contains("0"))return false;
        int temp = num;
        while(num>0)
        {
            int digit = num%10;
            num/=10;
            if(temp%digit==0)return false;
        }
        return true;
    }
    static boolean palindrome(int n)
    {
        int temp=n,rev=0;
        while(n>0)
        {
            int digit=n%10;
            n/=10;
            rev = rev*10+digit;
        }
        return (temp==rev)?true:false;
    }
    
    static boolean checkparanthesis(String s,int n)
    {
        Stack<Character>st = new Stack<>();
        for(int i=0;i<n;i++)
        {
            if(s.charAt(i)=='(')st.push('(');
            else
            {
                if(st.size()==0)return false;
                else st.pop();
            }
        }
        return (st.size()==0)?true:false;
    }
    static int[] reverse(int a[]){

        for(int i=0;i<a.length/2;i++)
        {
           int temp = a[i];
           a[i] = a[a.length-i-1];
           a[a.length-i-1] = temp;
        }
        return a;
        }
   static boolean[] sieve(int n)
   {
   	boolean[] isPrime = new boolean[n+1];
   	Arrays.fill(isPrime,true);
   	isPrime[0]=false;
   	isPrime[1]=false;
   	for(int i=2;i*i<=n;i++)
   	{
   		for(int j=i*i;j<=n;j+=i)
   		{
   			isPrime[j]=false;
   		}
   	}
   	return isPrime;
   }
   static long gcd(long a, long b)
   {
     if (b == 0)
       return a;
     return gcd(b, a % b);
   }
    static class FastScanner {
        BufferedReader br;
        StringTokenizer st;
 
        public FastScanner() throws FileNotFoundException {
            
            if (System.getProperty("ONLINE_JUDGE") == null) {
                // Input is a file
                    br = new BufferedReader(new FileReader("input.txt")); 
    
                    // PrintWriter class prints formatted representations 
                    // of objects to a text-output stream. 
                    PrintStream pw = new PrintStream(new FileOutputStream("output.txt"));
                    System.setOut(pw);
              }
            else
            {
                // Input is System.in
                br = new BufferedReader(new InputStreamReader(System.in), 32768);
                st = null;
            }
            
        }
 
        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }
 
        int i() {
            return Integer.parseInt(next());
        }
 
        int[] intArray(int N) {
            int[] ret = new int[N];
            for (int i = 0; i < N; i++)
                ret[i] = i();
            return ret;
        }
 
        long l() {
            return Long.parseLong(next());
        }
 
        long[] longArray(int N) {
            long[] ret = new long[N];
            for (int i = 0; i < N; i++)
                ret[i] = l();
            return ret;
        }
 
        double nd() {
            return Double.parseDouble(next());
        }
 
        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }
}