Problem: Apart from having lots of holidays throughout the year, residents of Berland also have whole lucky years. Year is considered lucky if it has no more than 1 non-zero digit in its number. So years 100, 40000, 5 are lucky and 12, 3001 and 12345 are not.

You are given current year in Berland. Your task is to find how long will residents of Berland wait till the next lucky year.

Input

The first line contains integer number n (1 ≤ n ≤ 109) — current year in Berland.

Output

Output amount of years from the current year to the next lucky one.

Examples

Input

4


Output

1


Input

201


Output

99


Input

4000


Output

1000

Note

In the first example next lucky year is 5. In the second one — 300. In the third — 5000.

Solution (in JAVA):

Solution:
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.lang.reflect.Array;
import java.math.BigInteger;
import java.net.InetAddress;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Scanner;
import java.util.StringTokenizer;
import javax.swing.tree.TreeNode;


public class codeforces {
  

    public static int Binary(int x,int array[]){
        int min=0;
        int max=array.length-1;
        int mid=0;
        while(min<max){
            mid=(max+min)/2;
            if (array[mid]==x)return mid;
            if (x>array[mid])min=mid+1;
            if (x<array[mid])max=mid-1;
         
        
        
        }
    
    
    
        
    
    return 0;}
    
    
    
 
    
    
    public static void main(String[] args) throws IOException {
        Reader.init(System.in);
        PrintWriter pw=new PrintWriter(System.out);
        StringBuilder sb=new StringBuilder("");
        int year=Reader.nextInt(),year2=year,num=0,length=0;
        
        while(year2!=0){
         length++;
        if(year2/10==0)num=year2;
        year2/=10;
        
        
        }
          length--;
          int answer=1;
          for (int i = 0; i < length; i++) {
            answer*=10;
        }
            pw.println(answer-year%answer);
        
        pw.close();
        
        
        

              

       
       
               
        
       
             
        
       
    }
    
   
    
    
    
    
    
    
    
    
    
    
    
    }
    
 class Reader {
 
        static BufferedReader reader;
        static StringTokenizer tokenizer;
 
        public static int pars(String x) {
            int num = 0;
            int i = 0;
            if (x.charAt(0) == '-') {
                i = 1;
            }
            for (; i < x.length(); i++) {
                num = num * 10 + (x.charAt(i) - '0');
            }
 
            if (x.charAt(0) == '-') {
                return -num;
            }
 
            return num;
        }
 
        static void init(InputStream input) {
            reader = new BufferedReader(
                    new InputStreamReader(input));
            tokenizer = new StringTokenizer("");
        }
 
        static void init(FileReader input) {
            reader = new BufferedReader(input);
            tokenizer = new StringTokenizer("");
        }
 
        static String next() throws IOException {
            while (!tokenizer.hasMoreTokens()) {
                tokenizer = new StringTokenizer(
                        reader.readLine());
            }
            return tokenizer.nextToken();
        }
 
        static int nextInt() throws IOException {
            return pars(next());
        }
 
        static long nextLong() throws IOException {
            return Long.parseLong(next());
        }
 
        static double nextDouble() throws IOException {
            return Double.parseDouble(next());
        }
    }