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:
/*
 * PDPM IIITDM Jabalpur
 * Asutosh Rana
 */

import java.util.*;
import java.io.*;
import java.math.*;

public class Main
{
    long MOD = 1000000007;
    InputReader in;BufferedReader br;PrintWriter out;
    public static void main (String[] args) throws java.lang.Exception
    {
        Main solver = new Main();
        solver.in = new InputReader(System.in);
        solver.br = new BufferedReader(new InputStreamReader(System.in));
        solver.out = new PrintWriter(System.out);
        solver.solve();
        solver.out.flush();
        solver.out.close();
    }

    public void solve(){
        
        int tc = 1;//in.readInt();
        
        for(int cas=1;cas<=tc;cas++){
            long N = in.readInt();
            long temp = N;
            long S = 1; 
            while((N/10)>0){
                N/=10;S*=10;
            }
            // out.println(S);
            long K = (temp/S)+1;
            // out.println(K);
            out.println(K*S-temp);
            
        }

    }
    
}
 
class InputReader{
    private InputStream stream;
    private byte[] buf = new byte[1024];
    private int curChar;
    private int numChars;
    private SpaceCharFilter filter;

    public InputReader(InputStream stream){this.stream = stream;}
    public int read(){
        if (numChars==-1) throw new InputMismatchException();
        if (curChar >= numChars){
            curChar = 0;
            try {numChars = stream.read(buf);}
            catch (IOException e){throw new InputMismatchException();}
            if(numChars <= 0) return -1;
        }
        return buf[curChar++];
    }

    public int readInt(){
        int c = read();
        while(isSpaceChar(c)) c = read();
        int sgn = 1;
        if (c == '-') {sgn = -1;c = read();}
        int res = 0;
        do {
            if(c<'0'||c>'9') throw new InputMismatchException();
            res *= 10;
            res += c - '0';
            c = read();
        }
        while (!isSpaceChar(c)); return res * sgn;
    }

    public void readInt(int[] A){
        for(int i=0;i<A.length;i++)
            A[i] = readInt();
    }

    public long readLong() {
        int c = read();
        while (isSpaceChar(c))
            c = read();
        int sgn = 1;
        if (c == '-') {
            sgn = -1;
            c = read();
        }
        long res = 0;
        do {
            if (c < '0' || c > '9')
                throw new InputMismatchException();
            res *= 10;
            res += c - '0';
            c = read();
        }
        while (!isSpaceChar(c));
        return res * sgn;
    }

    public void readLong(long[] A){
        for(int i=0;i<A.length;i++)
            A[i] = readLong();
    }

    public double readDouble() {
        int c = read();
        while (isSpaceChar(c))
            c = read();
        int sgn = 1;
        if (c == '-') {
            sgn = -1;
            c = read();
        }
        double res = 0;
        while (!isSpaceChar(c) && c != '.') {
            if (c == 'e' || c == 'E')
                return res * Math.pow(10, readInt());
            if (c < '0' || c > '9')
                throw new InputMismatchException();
            res *= 10;
            res += c - '0';
            c = read();
        }
        if (c == '.') {
            c = read();
            double m = 1;
            while (!isSpaceChar(c)) {
                if (c == 'e' || c == 'E')
                    return res * Math.pow(10, readInt());
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                m /= 10;
                res += (c - '0') * m;
                c = read();
            }
        }
        return res * sgn;
    }

    public char[] readCharA(){
        return readString().toCharArray();
    }

    public String readString() {
        int c = read();
        while (isSpaceChar(c))
            c = read();
        StringBuilder res = new StringBuilder();
        do {
            res.appendCodePoint(c);
            c = read();
        } while (!isSpaceChar(c));
        return res.toString();
    }

    public boolean isSpaceChar(int c) {
        if (filter != null)
            return filter.isSpaceChar(c);
        return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
    }

    public String next() {
        return readString();
    }

    public interface SpaceCharFilter {
        public boolean isSpaceChar(int ch);
    }

}